A TV tower is 40 m high , A mass of 5kg is dropped from its top. calculate the potential energy at the top and kinetic energy just before it hits the ground .

according to law of conservation of energy

potential energy at top = kinetic energy at bottom


potential energy at top, U = mgh


m = mass = 5kg

g = acceleration due to gravity = 9.81m/s2

h = height = 40m


U = 5 x 9.81 x 40

thus, we have

U = 1962 J


kinetic energy at top, E = U = 1962J

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