Physics (Science)

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For my physics class, we have to design our own experiments to calculate the amount of power exerted for each situation. However, I'm really unsure of how to go about finding the power for the situations.
The first situation is doing a push-up, and the second is pushing a car.
I was thinking that for the first one, you could simply use P = mgd/t to find the work and power done against gravity using the mass of the person, acceleration of gravity, time taken to do a half push-up, and the vertical displacement of the person. However, I am completely lost on what to do for the second experiment.

Any suggestions would be great!

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