5. Alex throws a 0.43-kg rubber ball down onto the floor. The ball?s speed just

Question

5. Alex throws a 0.43-kg rubber ball down onto the floor. The ball?s speed just before impact is 6.5 m/s, and just after is 5.5m/s. What is the impulse from the floor to the ball during he collision? a. 0.09 kg-m/s b. 1.0 kg-m/s c. 4.3 kg-m/s d. 5.2 kg-m/s 6. A 6-kg object is moving to the right at 4 m/s and collides with a 4-kg object moving to the left at 6 m/s. The objects collide and stick together. After the collision, the combined object: a. has the same kinetic energy that the system had before the collision b. has more kinetic energy than the system had before the collision c. has zero kinetic energy. d has less momentum than the system had before the collision. 7. A car is travelling at 25 mph. If its velocity is doubled then a. Its Momentum is doubled and Kinetic Energy is quadrupled. b. Its Momentum is doubled and Kinetic Energy is doubled. c. Its Momentum is quadrupled and Kinetic Energy is doubled. d. Its Momentum is quadrupled and Kinetic Energy is quadrupled.

Explanation / Answer

5. impulse J = Ft = m(v-u)

J = 0.43 * (6.3-5.5)

J = 5.2 kgm/s

option D

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6. V = 6*4+(4*6)/10

V = 2.4 m/s

optin option D

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7. as KE = 0.5 mv^2   am d mementum P = mv

if V doubles

KE = quadraples and P doubles

option A

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