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Class 11
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Physics
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Motion in a Straight Line
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Medium Questions
Motion In A Straight Line
Physics
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Easy Qs
Med Qs
Hard Qs
>
Two cars are travelling towards each other on a straight road at velocities
1
5
m
/
s
and
1
6
m
/
s
respectively. When they are
1
5
0
m
apart, both the drivers apply the brakes and the cars decelerate at
3
m
/
s
2
and
4
m
/
s
2
until they stop. Separation between the cars when they come to rest is :
A
8
6
.
5
m
B
8
9
.
5
m
C
8
5
.
5
m
D
8
0
.
5
m
Medium
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The average velocity of a freely falling body is numerically equal to half of the acceleration due to gravity. The velocity of the body as it reaches the ground is numerically equal to:
A
g
B
2
g
C
2
g
D
2
g
Medium
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>
A driver takes
0
.
2
0
s
to apply the brakes after he sees a need for it. This is called the reaction time of the driver. If he is driving a car at a speed of
5
4
k
m
/
h
and the brakes causes a deceleration of
6
.
0
m
/
s
2
, find the distance traveled by the car after he sees the need to put the brakes on.
A
1
8
.
6
3
m
B
2
0
m
C
2
6
.
8
5
m
D
2
7
.
6
7
m
Medium
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>
For a body moving with uniform acceleration
a
, initial and final velocities in a time interval
t
are
u
and
v
respectively. Then, its average velocity in the time interval
t
is :
A
(
v
+
2
a
t
)
B
(
v
−
2
a
t
)
C
(
v
−
a
t
)
D
(
u
+
2
a
t
)
Medium
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>
A ball dropped from one metre above the top of a window, crosses the window in
t
1
s
. If the same ball is dropped from
2
m
above the top of the same window, time taken by it to cross the window is
t
2
s
. Then
A
t
2
=
t
1
B
t
2
=
2
t
1
C
t
2
>
t
1
D
t
2
<
t
1
Medium
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>
A bus starts from rest and moves with a uniform acceleration of
1
m
s
−
2
. A boy
1
0
m
behind the bus at the start runs at a constant speed and catches the bus in
1
0
s
. Speed of the boy is :
A
1
0
m
s
−
1
B
1
m
s
−
1
C
6
m
s
−
1
D
4
m
s
−
1
Medium
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>
A train accelerates from rest at a constant rate
a
1
for distance
S
1
and time
t
1
. After that it decelerates to rest at a constant rate
a
2
for distance
S
2
at time
t
2
. Then the correct relation among the following is
A
S
2
S
1
=
a
2
a
1
=
t
2
t
1
B
S
2
S
1
=
a
1
a
2
=
t
2
t
1
C
S
2
S
1
=
a
2
a
1
=
t
1
t
2
D
S
2
S
1
=
a
1
a
2
=
t
1
t
2
Medium
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>
A proton in a uniform electric field moves along a straight line with constant acceleration starting from rest. If it attains a velocity
4
×
1
0
3
k
m
/
s
at a distance of
2
c
m
, the time required to reach the given velocity is :
A
1
0
−
3
s
B
1
0
−
6
s
C
1
0
−
8
s
D
1
0
−
5
s
Medium
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>
From a building two balls A & B are thrown such that A is thrown upwards and B downwards (both vertically with same speed). If
V
A
and
V
B
are their respective velocities on reaching the ground then :
A
V
B
<
V
A
B
V
A
=
V
B
C
V
A
<
V
B
D
Their velocities depends on their masses
Medium
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>
The average velocity of a body moving with uniform acceleration after travelling a distance of
3
.
0
6
m
is
0
.
3
4
m
/
s
. The change in velocity of the body is
0
.
1
8
m
/
s
. During this time, its acceleration is
A
0
.
0
1
m
/
s
2
B
0
.
0
2
m
/
s
2
C
0
.
0
3
m
/
s
2
D
0
.
0
4
m
/
s
2
Medium
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>