Question #128492

2.A bike rider approaches a hill with a speed of 8.5m/s. The total mass of the bike and rider is 85kg.

a.Find the kinetic energy of the bike and rider before going up the hill.

b.The rider coasts up the hill. Assuming there is no friction, at what height will the bike come to a stop?

c.Does your answer depend on the mass of the bike and rider? Explain.

a.Find the kinetic energy of the bike and rider before going up the hill.

b.The rider coasts up the hill. Assuming there is no friction, at what height will the bike come to a stop?

c.Does your answer depend on the mass of the bike and rider? Explain.

Expert's answer

A)

** K.E** = "\\tfrac{85 * 8.5^{2}}{2}=3070.62J=3.07kJ"

B)

"mgh= \\tfrac{mv^{2}}{2}"

"height= \\tfrac{v^{2}}{2g}"

"height= \\tfrac{8.5^{2}}{2*9.81}\t=3.68m"

C)

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