Q.

An object of mass 8 kg is at a certain height above the ground. If the potential energy of the object is 480 J, find the height at which the object is with respect to the ground. Given, g = 10 m s–2.

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a

3 m

b

6 m

c

12 m

d

9 m

answer is B.

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Detailed Solution

Mass of the object, m = 12 kg,

Potential energy, Ep = 480 J.

Ep = mgh

480 J = 8 kg × 10 m s–2 × h

h = 480 J /80 kg m s–2 = 6 m.

The object is at the height of 6 m.

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An object of mass 8 kg is at a certain height above the ground. If the potential energy of the object is 480 J, find the height at which the object is with respect to the ground. Given, g = 10 m s–2.