Q. 38

# A raindrop of mass 1.00 g falling from a height of 1 km hits the ground with a speed of 50 m s–1. Calculate(a) the loss of P.E. of the drop.(b) the gain in K.E. of the drop.(c) Is the gain in K.E. equal to loss of P.E.? If not why.Take g = 10 m s-2

Mass m of drop = 1g = 0.001 kg

Change in height Δ h = 1 km = 1000 m

Final velocity = 50 the drop starts from rest, initial velocity = 0 initial K.E = 0 J

And final K.E = a) Loss in P.E. = b) Gain in K.E. c) No, the gain in K.E. equal to loss of P.E. is not the same because of resistance like drag and viscous force against the drop.

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