Two balls of equal mass are thrown against a massive wall with equal velocities.The first rebounds with a speed equal to its striking speed,and the second sticks to the wall.The impulse that the first ball transmits to the wall,relative to the second,is
A)twice as great.
B)half as great.
C)the same.
D)four times as great.
E)one-fourth as great.

Question

Quizplus · Accepted Answer

The first ball experiences a change in velocity that is twice its initial velocity (since it reverses direction at the same speed), while the second ball comes to a stop, experiencing a change in velocity equal to its initial velocity. Therefore, the impulse (which depends on the change in momentum, and thus velocity, for a given mass) transmitted by the first ball is twice as great as that transmitted by the second ball.

Two Balls of Equal Mass Are Thrown Against a Massive