Suddenly a worker picks up the bag of gravel. Use energy conservation to find the speed of the bucket after it has descended 2.30 m from res

Question

Suddenly a worker picks up the bag of gravel. Use energy conservation to find the speed of the bucket after it has descended 2.30 m from rest. (You can check your answer by solving this problem using Newton’s laws.)

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Acacia 6 months 2021-07-28T03:22:51+00:00 1 Answers 0 views 0

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  1. Nem
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    2021-07-28T03:24:07+00:00
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    Explanation:

    A worker picks up the bag of gravel. We need to find the speed of the bucket after it has descended 2.30 m from rest. It is case of conservation of energy. So,

    \dfrac{1}{2}mv^2=mgh\\\\v=\sqrt{2gh}

    h = 2.3 m

    v=\sqrt{2\times 9.8\times 2.3} \\\\v=6.71\ m/s

    So, the speed of the bucket after it has descended 2.30 m from rest is 6.71 m/s.

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