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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.)

Respuesta :

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,

[tex]\dfrac{1}{2}mv^2=mgh\\\\v=\sqrt{2gh}[/tex]

h = 2.3 m

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

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

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