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Class 11
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Physics
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Motion in a Straight Line
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Hard Questions
Motion In A Straight Line
Physics
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A person sitting in the rear end of the compartment throws a ball towards the front end.The ball follows a parabolic path.The train is moving with velocity of
2
0
m
/
s
.A person standing outside on the ground also observes the ball.How will the maximum heights
y
m
attained and the ranges
R
seen by the thrower and the outside observer compare with each other?
A
same
y
m
different
R
B
same
y
m
and
R
C
differently
y
m
same
R
D
differently
y
m
and
R
Hard
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A particle moves with a non zero initial velocity
v
0
and retardation
k
v
, where
v
is the velocity at any time
t
.
A
The particle will cover a total distance
k
v
0
B
The particle comes to rest at
t
=
k
1
C
Particle continues to move for long time
D
at time
α
1
,
v
=
2
v
0
Hard
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Mass
A
is released from rest at the top of a frictionless inclined plane
1
8
m
long and reaches the bottom
3
s
later. At the instant when
A
is released, a second mass
B
is projected upwards along the plate from the bottom with a certain initial velocity. Mass
B
travels a distance up the plane, stops and returns to the bottom so that it arrives simultaneously with
A
. The two masses do not collide. Initial velocity of
B
is
A
4
m
s
−
1
B
5
m
s
−
1
C
6
m
s
−
1
D
7
m
s
−
1
Hard
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STATEMENT-1: For an observer looking out through the window of a fast moving train, the nearby objects appear to move in the
opposite direction to the train, while the distant objects appear to be stationary.
STATEMENT-2:
If the observer and the object are moving at velocities
V
1
and
V
2
respectively with reference to a laboratory frame, the velocity of the object with respect to the observer is
V
2
−
V
1
.
A
STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1
B
STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1
C
STATEMENT -1 is True, STATEMENT-2 is False
D
STATEMENT -1 is False, STATEMENT-2 is True
Hard
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The displacement of a particle moving in a straight line is given by
x
=
1
6
t
−
2
t
2
(where,
x
is in meters and
t
is in second). The distance traveled by the particle in
8
seconds [starting from
t
=
0] is
A
2
4
m
B
4
0
m
C
6
4
m
D
8
0
m
Hard
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>
A water tap leaks such that water drops fall at regular intervals. Tap is fixed
5
m
above the ground. First drop reaches the ground and at that very instant third drop leaves the tap. At this instant the second drop is at a height of
A
3
m
B
4
.
5
m
C
3
.
7
5
m
D
2
.
5
m
Hard
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A train of length
l
=
3
5
0
m
starts moving rectilinearly with constant acceleration
ω
=
3
.
0
⋅
1
0
−
2
m
/
s
2
;
t
=
3
0
s
after the start the locomotive headlight is switched on (event 1), and
τ
=
6
0
s
after that event the tail signal light is switched on (event 2) . At what constant velocity
V
(in m/s) relative to the Earth must a certain reference frame
K
move for the two events to occur in it at the same point? (round off your answer to the nearest integer)
Hard
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A ball is thrown vertically upwards (relative to the train) in a compartment of a moving train. The face of the person sitting inside the compartment is towards engine of the train.
A
The ball will maintain the same horizontal velocity as that of the person (or the compartment) at the time of throwing.
B
If the train is accelerating then the horizontal velocity of the ball will be different from that of the train velocity, at the time of throwing.
C
If the ball appears to be moving backward to the person sitting in the compartment it means that speed of the train is increasing.
D
If the ball appears to be moving ahead of the person sitting in the compartment it means the train's motion is retarding.
Hard
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Using the table given below where the values of velocity at the end of t seconds for a body under linear motion are given
V
(
m
s
−
1
)
0
6
12
24
30
36
42
t
(
s
)
0
2
4
8
10
12
14
What can be concluded about the motion of the body?
A
It moves with uniform speed.
B
It moves with uniform motion
C
It moves with uniform velocity
D
It moves with uniform acceleration
Hard
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The acceleration (a) of a particle is plotted on the Y-axis while the time (t) elapsed is plotted along the X - axis. What does the a - t graph give?
A
The distance covered
B
The difference in velocities
C
The difference in acceleration
D
The difference in force
Hard
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