A 100 kg cart, initially at rest, falls down a 20m high cliff. (a) Assume that...

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A 100 kg cart, initially at rest, falls down a 20m high cliff. (a) Assume that...

A 100 kg cart, initially at rest, falls down a 20m high cliff. (a) Assume that it experiences a constant average upward air drag force of 25N. At 5m below, what is the change of gravitational potential energy of the cart? (b) What is the gain of its kinetic energy? (c) What is the change of its mechanical energy?

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