We calculate the boy’s work using the formula:
A = F * S, where A is the work done by the boy (A = 784 J), F is the force applied by the boy (F = Fт = m * g, where m is the mass of the bucket with water, g is the acceleration of gravity (we take g = 9.8 m / s ^ 2)), S – bucket movement (well depth, S = h = 10 m).
A = F * S = m * g * h.
Let’s calculate the mass of a bucket of water:
m = A / (g * h) = 784 / (9.8 * 10) = 8 kg.
Answer: The mass of a bucket of water is 8 kg.
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