Question

A bag of wheat weigh 60 kg. Find the height to which it is lifted so that it's potential energy is 3000 joule (g=10)
NCERT Class IX
Sciences - Main Course Book
Chapter 11. Work and Energy

Answer 1

P.E=m*g*h
3000=60*h*10
h=3000/60*10
h=3000/600
h=5m

Answer 2

Given:

Mass of bag=60kg

Potential energy=3000J

To find:

The height to which the bag is lifted

Solution:

The height to which the bag is lifted is 5m.

Let the height be H.

The potential energy is the product of mass, height, and gravitational acceleration.

Also, g=10m/$s^{2}$

Potential energy=Mass×height×g

Using the values,

3000=60×10×H

3000/600=H

5=H

Therefore, the height to which the bag is lifted is 5m.