Question

An abject of mass 40 kg is raised to a height of 5m above the ground. What is its potential energy? If the abject is allowed to fall, find its kinetic energy when it is half way down (g=10m/s)

Answer 1

PE = mgh = 40(10)(5) = 2000J

when the object is half way the kinetic energy is equal to the potential energy

potential energy in half way = 2000/2 = 1000J

therefore the kinetic energy in half way is 1000J

Answer 2

_/\_Hello mate__here is your answer--

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Given:-

m = 40 kg

g = 9.8 m/s^2

h = 5 m

We know that,

potential energy = mgh

= 40 × 9.8 × 5 J

= 1960 J

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♦♦The total mechanical energy (Kinetic and potential energy) of an object remains constant. (law of conservation of energy)

Therefore, when the object is half-way down, its potential energy become half the original energy and remaining half converted into kinetic energy.

Hence, the kinetic energy = ½ (1960) J = 980 J

I hope, this will help you.☺

Thank you______❤

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