A body of mass 2kg is released from from a point 100m above the ground level. calculate kinetic energy 80m from the point of released.​

Question

A body of mass 2kg is released from from a point 100m above the ground level. calculate kinetic energy 80m from the point of released.​

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Khang Minh 3 years 2021-07-14T02:08:48+00:00 1 Answers 20 views 0

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  1. diemthu
    0
    2021-07-14T02:09:50+00:00
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    Answer:

    1568J

    Explanation:

    Since the problem states 80 m from the point of drop, the height relative to the ground will be 100-80=20m.

    Use conservation of Energy

    ΔUg+ΔKE=0

    ΔUg= mgΔh=2*9.8*(20-100)=-1568J

    ΔKE-1568J=0

    ΔKE=1568J

    since KEi= 0 since the object is at rest 100m up, the kinetic energy 20meters above the ground is 1568J

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