You observe someone pulling a block of mass 48 kg across a low-friction surface. While they pull a distance of 3.0 m in the direction of motion, the speed of the block changes from 4.9 m/s to 7.7 m/s.

Calculate the magnitude of the force exerted by the person on the block.

This I figured out using moment principle and the position update formula. 282 N.

What was the change in internal energy (chemical plus thermal) of the person pulling the block?

How do I get this? I know that DEtot = q + W, I can find W and Kinetic energy. but what other energies would be included in Ei and Ef?

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  1. Also, I know the rest energies would cancel out.

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