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Unformatted text preview: a) How much work is done on the snowball by the gravitational force during its flight to the flat ground below the cliff? The work done by gravity is W g = -mg(y f y i ) = mgh = 98.0 J b) What is the kinetic energy of the snowball when it hits the ground? According to the work-kinetic energy theorem, the work done by the net force on an object is equal to the change in kinetic energy of the object. The only force exerted on the snowball during its flight is gravity. The final kinetic energy is K = W g K f = (1/2)mv i 2 + mgh= 154 J...
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This note was uploaded on 12/10/2011 for the course PHY 2048 taught by Professor Field during the Spring '08 term at University of Florida.
- Spring '08