Solve
Study
Textbooks
Guides
Use app
Login
>>
Class 11
>>
Physics
>>
Work, Energy and Power
>>
Medium Questions
Work Energy And Power
Physics
4859 Views
JEE Mains
NEET
Easy Qs
Med Qs
Hard Qs
>
A ball of mass
′
m
′
moves towards a wall with a velocity
′
u
′
, the direction of motion making an angle
θ
with the surface of the wall and rebounds with the same period. The change in momentum of the ball during the collision is:
A
2
m
u
s
i
n
θ
towards the wall
B
2
m
u
s
i
n
θ
away from the wall
C
2
m
u
c
o
s
θ
towards the wall
D
2
m
u
c
o
s
θ
away from the wall
Medium
View solution
>
A
5
0
0
g
m
ball moving at
1
5
m
/
s
slows down uniformly until it stops. If the ball travels
1
5
m
, what was the average net force applied while it was coming to a stop?
A
0
.
3
7
5
N
B
3
.
7
5
N
C
3
7
.
5
N
D
6
.
2
5
N
Medium
View solution
>
A perfectly elastic ball
p
1
of mass 'm' moving with velocity v collides elastically with three exactly similar balls
p
2
,
p
3
,
p
4
lying on a smooth table. Velocities of the four balls after collision are
A
0,0,0,0
B
v,v,v,v
C
v,v,v,0
D
0,0,0,v
Medium
View solution
>
Same force acts on two bodies of masses
m
1
and
m
2
(
m
2
>
m
1
). After travelling the same distance,
A
Kinetic energy of
m
2
is greater than kinetic energy of
m
1
B
Kinetic energy of
m
1
is greater than kinetic energy of
m
2
C
Ratio of kinetic energies of those two is equal to ratio of their momentum
D
Kinetic energy of
m
1
is equal to kinetic energy of
m
2
Medium
View solution
>
A particle moves under the effect of a force
F
=
C
x
from
x
=
0
to
x
=
x
1
. The work done in the process is (treat
C
as a constant):
A
x
1
2
C
2
B
C
x
1
2
C
2
C
x
1
2
D
x
1
2
C
Medium
View solution
>
A body is moving with a velocity
1
m
s
−
1
a force
F
is needed to stop it within a distance
x
. If the speed of the body is
3
m
s
−
1
, the force needed to stop it with in the same distance (
x
) will be:
A
9
F
B
6
F
C
3
F
D
1
.
5
F
Medium
View solution
>
A heavier body moving with certain velocity collides head on elastically with a lighter body at rest. Then
A
smaller body continues to be in the same state of rest
B
smaller body starts to move in the same direction with same velocity as that of bigger body
C
the smaller body starts to move with twice the velocity of the bigger body in the same direction
D
the bigger body comes to rest
Medium
View solution
>
A ball of mass M moving with a velocity V collides head on elastically with another of same mass but moving with a velocity v in the opposite direction. After collision,
A
the velocities are exchanged between the two balls
B
both the balls come to rest
C
both of them move at right angles to the original line of motion
D
one ball comes to rest and another ball travels back with velocity 2V
Medium
View solution
>
Two identical balls collide head on. The initial velocity of one is
0
.
7
5
cm
−
1
. While that of the other is
−
0
.
4
3
ms
−
1
. If the collision is perfectly elastic. Their respective final velocities are
A
0
.
7
5
ms
−
1
,
−
0
.
4
3
ms
−
1
B
−
0
.
4
3
ms
−
1
,
0
.
7
5
ms
−
1
C
−
0
.
7
5
ms
−
1
,
0
.
4
3
ms
−
1
D
0
.
4
3
ms
−
1
,
0
.
7
5
ms
−
1
Medium
View solution
>
A rain drop of mass (1/10) gram falls vertically at constant speed under the influence of the forces of gravity and viscous drag. In falling through
100 m, the work done by gravity is
A
0.98 J
B
0.098 J
C
9.8 J
D
98 J
Medium
View solution
>