If you drop a rock on Mars from a height of 13.2 m, at what speed does it hit the ground? MMars=6.42×1023kg, RMars = 3390 km. Express your answer with the appropriate units.

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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

A20 cm long spring is attached to a wall. the spring stretches to a length of 22 cm when you pull on it with a force of 100 n. what is the spring constant