# A 150-kg roller-coaster car climbs to the top of a 91 - m -high hill. How much work is done against gravity as the car is lifted to the top of the hill ?

1 answer

###### Question:

A 150-kg roller-coaster car climbs to the top of a 91 - m -high hill. How much work is done against gravity as the car is lifted to the top of the hill ?

## Answers

Answer:10 m/sExplanation:The potential energy of the roller coaster is converted to kinetic energy. According to law of transformation of energy, potential energy = kinetic energy.mgh = ½mv².Take g as 10m/s².150 * 10 * 50 = ½ * 150 * v².7500 = 75v².v² = 7500/75.v = √100.v= 10 m/s

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