Which of the following are examples of mechanical energy? Choose all that apply. *
3 points
stretching a rubber band
charging your cell phone
squishing a playground ball
squeezing and releasing a spring
lighting a match

Could someone . i have tried to solve myself but my calculation is off

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.

Discuss how the hardness or softness of the landing surface is related to the time required to stop the egg