# College Physics

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Part A) A 2.2 kg rock is released from rest at the surface of a pond 1.8 m deep. As the rock falls, a constant upward force of 5.0 N is exerted on it by water resistance. Let y=0 be at the bottom of the pond. Calculate the nonconservative work, Wnc , done by water resistance on the rock, the gravitational potential energy of the system, U , the kinetic energy of the rock, K , and the total mechanical energy of the system, E , when the depth of the rock below the water's surface is 0 m.
Part B) What is the Wnc of the water resistance on the rock, U, K, and E when the rock is 0.50 m below the surface?
Part C) What is the Wnc of the water resistance on the rock, U, K, and E when the rock is 1.0 m below the surface?

• College Physics -

Nonconservative work done is the product of the water resistance force and the distance it has fallen.

They have not mentioned the density of the rock. There will be a buoyancy force on the rock that should be considered, so some of the answers they want may not be the correct ones