23. a pogo stick has a spring with a force constant of 2.50×104n/m , which can be compressed 12.0 cm. to what maximum height can a child jump on the stick using only the energy in the spring, if the child and stick have a total mass of 40.0 kg? explicitly show how you follow the steps in the problem-solving strategies for energy.

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