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Gravitational Force

A rain drop o...

Question

A rain drop of radius $2 m m$ falls from a height of $250 m$ above the ground. What is the work done by the gravitational force on the drop? (Density of water $= 1000 k g / m^{3}$ )

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Solution

m=density $\times$ volume
W=mgh= $1000 \times \frac{4}{3} π (2 \times 10^{- 3})^{3} \times 10 \times 250 = 0.08 N$

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