Advertisement Remove all ads

# A Boy Weighing 50 Kg Climbs up a Vertical Height of 100 M. Calculate the Amount of Work Done by Him. How Much Potential Energy Does He Gain? (G = 9.8 M/S2) - Science

Short Note

A boy weighing 50 kg climbs up a vertical height of 100 m. Calculate the amount of work done by him. How much potential energy does he gain? (g = 9.8 m/s2)

Advertisement Remove all ads

#### Solution

(i) Mass of the boy, (m) = 50 kg
Height above the ground, (h) = 100
Acceleration due to gravity, (g) = 9.8 m/s2
We can calculate the work done against gravity as,
Work done in lifting a body = (Weight of body) × (Vertical distance)
So, W = m × g × h
So work done,
W = 50 × 9.8 × 100 J
= 49 KJ
Now, potential energy of a body kept at the same height is equal to the amount of work done against gravity in moving the body to that position. Therefore, the potential energy of the boy at that height is 49 KJ .

Is there an error in this question or solution?
Advertisement Remove all ads

#### APPEARS IN

Lakhmir Singh Science Class 9 Physics
Chapter 4 Work and energy
Short Answers | Q 38 | Page 146
Advertisement Remove all ads

#### Video TutorialsVIEW ALL 

Advertisement Remove all ads
Share
Notifications

View all notifications

Forgot password?
Course