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Please help a.How high will a 1.60-kg rock go from the point of release if thrown...

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a.How high will a 1.60-kg rock go from the point of release if thrown straight up by someone who does 80.0 J of work on it? Neglect air resistance. Express your answer to three significant figures and include the appropriate units.

b.A bicyclist coasts down a 9.0 ∘ hill at a steady speed of 6.0 m/s . Part A Assuming a total mass of 95 kg (bicycle plus rider), what must be the cyclist's power output to climb the same hill at the same speed? Express your answer to two significant figures and include the appropriate units.

c.How much work can a 6.0-hp motor do in 5.0 h ? Express your answer to two significant figures and include the appropriate units.

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