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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Khánh Gia 2 months 2021-07-23T00:53:09+00:00 1 Answers 5 views 0

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    2021-07-23T00:54:12+00:00

    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)

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