9. An 80g stone is released at the top of a vertical cliff. After falling for 3s, it reaches the floor of the cliff and penetrates 9cm into the ground. Determine
the height of the cliff
the average force resisting penetration of the ground by the stone.

The man fires an 80 g arrow so that it is moving at 80 m/s when it hits and embeds in a 8.0 kg block resting on ice. how far will the block slide on the ice before stopping? a 7.1 n friction force opposes its motion.

=force × distance a. work b. velocity c. pressure d. momentum

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final