Answer :

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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