148. A ball of mass 1 kg moving with a velocity of 2 m/sec collides directly on a stationary ball of mass 2 kg and comes to rest after impact. The velocity of the second ball after impact will be

A.Zero

B.0.5 m/sec

C.1.0 m/sec

D.2.0 m/sec

149. The units of momentum are same as of

A.Work

B.Energy

C.Force

D.Impulse

150. Impulse is defined as

A.Mass x velocity

B.Force x time

C.Mass acceleration

D.Force x distance

151. The masses of two balls are in the ratio of 2:1 and their respective velocities are in the ratio of 1:2 but in the opposite direction before impact. If the coefficient of restitution is 1/2, the velocities of separation of the balls will be equal to

A.Original velocity in the same direction

B.Half the original velocity in the same direction

C.Half the original velocity in the opposite direction

D.Original velocity in the opposite direction

152. The work done by a body in moving down a smooth inclined plane in comparison to being dropped vertically downwards from same height will be

A.More

B.Less

C.Equal

D.Zero

153. A body of mass m in moving with a constant velocity v hits another body of same mass at rest and sticks to it. The velocity of both together will be equal to

A.v

B.Zero

C.2v

D.v/2

154. A marble ball is rolled on a smooth floor of a room to hit a wall. If the time taken by the ball in returning to the point of projection is twice the time taken in reaching the wall, the coefficient of restitution between the ball and the wall is

A.0.25

B.0.5

C.0.75

D.1

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