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Q.

An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy?


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a

1960 J

b

2940 J

c

980 J

d

490 J 

answer is A.

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Detailed Solution

The potential energy is given by 1960 J
Given:
the mass of the object (m)= 40kg
Height(h) =5 m
We need to find Potential energy.
Potential energy (P.E)  is given by the expression,
P.E = m × g × h
Where
●        m = Mass of the object
●        h = Vertical displacement
●        g = Acceleration due to gravity  (9.8 ms-2)
P.E = 40 × 9.8 × 5
⇒ P.E = 1960 J
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