Question

An object of 100N weight is raised to a height of 15m. find the potential energy of the object at that height. Also find the new potential energy when :–. a) the same object is raised to half of it's original height. b) the same object is raised to three times original height​

Answer 1

Answer:

(a) ⇒ 750 joules

(b) ⇒ 4500 joules

Explanation:

Potential Energy PE = mgh

where m is the mass ( kg);

g =  gravitational field strength ( N/Kg); and

h = height (m)

PE = 100 × 15

= 1500 joule

(a) When the same object is raised half of its original height

h' = h ÷ 2

h' = 15 ÷ 2

h' = 7.5 m

Using formula of potential energy

PE = mgh'

PE = 100 × 7.5

PE = 750 joule

(b) When the same object is raised to three times original height​

h' = h × 3

h' = 15 × 3

h' = 45 m

Using formula of potential energy

PE = mgh'

PE = 100 × 45

PE = 4500

Hope this helps.

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