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A 4.0 kg object is thrown downward with a velocity v=3.0 m/s from a height of 5.5 m above the ground. a) Neglecting air resistance,

A 4.0 kg object is thrown downward with a velocity v=3.0 m/s from a height of 5.5 m above the ground.

a) Neglecting air resistance, determine the object's speed just before it hits the ground.

b)If there is air drag and the work done by the air resistance is W = -50 J, what is the speed of the ball just before it hits the ground.

c) What is the force of air resistance acting on the object?

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