Question

An object of mass 5 kg is dropped from height of 10 m. Find its kinetic energy when it is half way down. (class 9th)

Answer 1

m= 5kg

When it is halfway down,

h= 10/2=5m

Loss in PE=Gain in KE

mgh= KE

5×10×5= KE

KE=250J

Answer 2

Answer:

The kinetic energy will be 490 J.

Explanation:

Given that,

Mass of the object m = 5 kg

Height h = 10 m

We know that,

Loss in potential energy = gain in kinetic energy

$mgh= k.E$

Here, m = mass

h = height

$5\times9.8\times10= K.E$

$K.E= 490\ J$

Hence, The kinetic energy will be 490 J.