Question

a body at a height of above the earth's surface has a potential energy of 500J. It is allowed to fall freely. It's potential energy at midpoint of its fall would be​

Answer 1

Answer:

Let a body of mass

′

m

′

placed at a height

′

h

′

above the ground, start falling down from rest.`

When the body falls from a height h to h/2, the potential energy is given as

2

mgh

.

The body covers the distance h/2 with a velocity v. We make use of the third equation of motion to obtain velocity of the body.

v

2

−u

2

=2aS

Here, u=0,a=g and S=x

v

2

−0=

2

2gh

,thatisv

2

=gh

Kinetic energy =

2

1

mv

2

That is, K.E=

2

mgh

Hence, at height h/2 the energy possessed is half potential energy and half the kinetic energy.

Explanation:

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