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1.
A spring with spring constant 
is extended from 
to 
. The work done will be
is extended from to . The work done will be
2.
An object of mass 
is tied to a string of length 
and a variable horizontal force is applied on it which starts at zero and gradually increases until the string makes an angel 
with the vertical. Work done by the force 
is
is tied to a string of length and a variable horizontal force is applied on it which starts at zero and gradually increases until the string makes an angel with the vertical. Work done by the force is
3.
A body moves a distance of 10 m along a straight line under action of 5 N force. If work done is 25 J, then angle between the force and direction of motion of the body will be
4.
A body of mass 
moving with a velocity 
collides with another body of the mass 
at, rest and comes to rest. The velocity of the second body due to collision is
moving with a velocity collides with another body of the mass at, rest and comes to rest. The velocity of the second body due to collision is
5.
If a lighter body (Mass 
and velocity 
) and a heavier body (mass 
and velocity 
) have the same kinetic energy, then
and velocity ) and a heavier body (mass and velocity ) have the same kinetic energy, then
6.
In which case does the potential energy decrease
7.
Two bodies 
and 
have masses 
and respectively. Each one is acted upon by a force of 
. If they acquire the same kinetic energy in times 
and 
, then the ratio 
is
and have masses and respectively. Each one is acted upon by a force of . If they acquire the same kinetic energy in times and , then the ratio is
8.
If reaction is R and coefficient of friction is
, what is work done against friction in moving a body by distance d?
, what is work done against friction in moving a body by distance d?
9.
The block of mass M moving on the frictionless horizontal surface collides with the spring of spring constant k and compresses it by length L. The maximum momentum of the block after collides is
10.
A body moving with a velocity v, breaks up into two equal parts. One of the part retraces back with velocity
Then, the velocity of the other part is
Then, the velocity of the other part is