Question

Determine the amount of potential energy of a 5 N book that is moved from the ground to three different shelves on a book case. The height of each shelf is 1 m, 1.5 m and 2 m from the ground.

Answer 1

Hi friend
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Your answer
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Weight of the book = 5 N

The book is moved from the ground to three different heights.

Now,
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Mass = m

Acceleration due to gravity = g

mg = 5 N (given)

Height = Either 1 m or 1.5 m or 2 m

Potential energy formula = m × g × h

Potential energy when the book is raised to a height of 1 m.

h = 1 m

Ep = (5 × 1) Joules = 5 J

When,
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The stone is moved to a height of 1.5 m.

Ep = ( 5 × 1.5) Joules = 7.5 J

Again,
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When the stone is moved to a height of 2 m.

Ep = (5 × 2) Joules = 10 J

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Answer 2

Potential energy =mgh
1
h=1m,mg=5N similarly
mgh=1 *5=5 joule
2
h=1.5, pe=mgh=5*1.5=7.5joule
3
h=2m,pe =mgh =5*2=10
Total=22.5 joule