157. If a ball which is dropped from a height of 2.25 m on a smooth floor attains the height of bounce equal to 1.00 m, the coefficient of the restitution between the ball and the floor is equal to

158. A ball moving with a velocity of 5 m per sec impinges on a fixed plane at an angle of 45°, its direction after impact is equally inclined to the line of impact. If coefficient of restitution is 0.5, the velocity of the ball after impact will be

159. Pick up the correct statement from the following : A rubber ball when strikes a wall rebounds but a lead ball of same mass and velocity when strikes the same wall falls down

160. Two pieces of steel and brass weighing 2 kg and 1 kg fall freely under action of gravity from a tower. After a distance, the following will be identical

161. If a solid and a hollow sphere of the same mass are allowed to roll down an inclined plane simultaneously, then

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