Question

an object of mass 40kg is raised to a height of 5m above the ground. what is its potential engry? if the object is allowed to fall, find the kinetic engry when it is half way down

Answer 1

Answer:

mas,m=40kg

height,h=5m

acceleration due to gravity,g=10m/s^2

potential energy,pe=mgh

                               =40x5x10

                              =2000J

we know that acc.to the law of conservation of energy

pe=kinetic energy,ke

1/2pe=1/2ke

2000/2=1/2ke

1000j=1/2ke

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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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