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## 1. 1500j of work was done to move a box 20m. What force was applied to the box ? 2. How much gravitational potential energy doe

Question

1. 1500j of work was done to move a box 20m. What force was applied to the box ?

2. How much gravitational potential energy does a 165kg roller coaster car have when it is at the top of a hill 42 meters above the ground?

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Physics
2 months
2021-07-23T00:53:09+00:00
2021-07-23T00:53:09+00:00 1 Answers
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## Answers ( )

Answer:1. 75N

2. 67,983 J (=67.98 kJ)

Explanation:1. Work = Force x Distance

we are given that Work = 1,500J and Distance = 20m

hence,

Work = Force x Distance

1,500 = Force x 20

Force = 1,500 ÷ 20 = 75N

2. Potential Energy, PE = mass x gravity x change in height

we are given that mass = 165 kg and change in height = 42m

assuming that gravity, g = 9.81 m/s²

Potential Energy, PE = mass x gravity x change in height

Potential Energy, PE = 165 x 9.81 x 42 = 67,983 J (=67.98 kJ)