Question

potential energy of an object 133009 20 joules if mass of an object is 40 kg find the height of an object where it is place if gravity is 9.8 m/sec²​

Answer 1

Explanation:

Given :

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

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