1. A rubber ball and lump of putty having the same mass are thrown with the same

Question

1. A rubber ball and lump of putty having the same mass are thrown with the same speed toward a wall. The ball bounces back with nearly the same speed with which it hit. The putty sticks to the wall. Which of the two experiences the greater momentum change? A) THE BALL B) THE PUTTY C) IN BOTH CASES THERE IS NO CHANGE IN MOMENTUM D) THEY EXPERIENCE THE SAME CHANGE IN MOMENTUM E) MORE INFORMATION IS NEEDED TO WORK OUT THE AMSWER .

2. After stealing a 20 kg bag of oranges a 80 kg theif finds himself at rest ona frozen lake. He attaches himself to the bag of orznges with a long rope and pushes himself off from the bag by giving himself a rightward velocity. when the rope run out: A) THE THIESF AND THE BAGG WILL STOP B) THE THIEF AND THE BAG OF ORANGES WILL MOVE TO THE LEFT BECAUSE THE THIEF HAS A LARGER MASS. C) THE TIEF AND THE BAG OF ORANGES WILL MOVE TO THE RIGHT BECAUSE THE THIEF HAS A LARGER MASS. D) THE THIEF AND THE BAG OF ORNGES WILL MOVE TO THE RIGHT BECAUSE THE THIEF HAS A LARGER KINETIC ENERGY E) THE THIEF AND THE BAG OF ORANGES WILL OVE TO THE LEFT BECAUSE THE THIEF HAS A LARGER KINETIC ENERGY

Pleas explain. For the first quetion i put the answear A) the ball but it keeps saying that its wrong. for the sencond one i put answaer c and d and it keeps saying that its wrong. im not rure what im doing wrong.

Explanation / Answer

1. vi = v

vf = - v

change in momentum, for ball = m (vf - vi)

= 2 m v

fro putty = m (v - 0) = m v

Ans: Ball

2. (A) from momentum conservation

( initial momentum of system = final momentum )

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