Unit 8 Lesson 1 Quiz 1.
0:16
A tennis ball falls off a shelf and bounces several times. Each bounce is lower than the
one before. Soon the ball stops. Why doesn't the ball keep bouncing?
A. O The energy becomes stored in the ball.
B. Some of the energy is changed into mass.
C. O Energy is transferred to the air and ground.
D. The air and ground slowly destroy the ball's energy.

3. a worker pushes a 30.5 kg polished stone along a polished table with a force on bonin a straight line for 5.20 s after starting from rest. there is no friction between thestone and the table. at the end of the table. the stone is hooked to a cable with a lengthof 62.0 cm to rotate it to a rough table to store until they can be picked up. the roughtable has a coefficient of static friction 0.702 with the polished stone. remember that 8= 9.80 m/s2a) what is the speed of the stone when it is hooked to the cable? b) what is the tension in the cable while the stone is rotating? (there is still nofriction)c) how much force is needed to make the stone begin sliding from rest on therough table? ius = 0.70262.0 cm30.5 kg20.5 kg6= 0