Question

An object of mass 40kg is raised to a height of 5m above the ground. What is it: Ep?​​

Answer 1

Answer:

Mass of the object M=40kg

Height upto which it is raised h=5 m

Potential energy P.E=Mgh

P.E=40×10×5=2000J

Let its kinetic energy be E

k

when it is half way down i.e h

′

=

2

h

According to conservation of energy,

K.E

i

+P.E

i

=K.E

f

+P.E

f

0+2000=E

k

+Mg

2

h

∴ 2000=E

k

+40×10×

2

5

⟹E

k

=1000J