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20. does the international space station have gravitational pe? ke? explain?
-It has gravitation pe.
I thought that Gravitational potential energy is the energy stored in an object as the result of its vertical position or height?

30.a moving hammer hits a nail and drives it into a wall. if the hammer hits the nail with twice the speed, how much deeper will the nail be driven? if it hits with three times the speed?

work = velocity^2
distance is proportional to velocity^2
so what is twice square?

would it be 4 times?

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