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Lakhmir Singh Solutions Class 9 Physics Solutions for Exercise in Chapter 4 - Work And Energy

Question 48 Exercise

A boy weighing 40kg makes a high jump of 1.5m

a) What is his kinetic energy at the highest point?

b) What is his potential energy at the highest point?

Answer:

Mass of boy, m = 40 kg

Height, h = 1.5m

Acceleration due to gravity, g = 10 m/s^2

a) At highest point velocity, v = 0

Therefore, KE = 0

b) PE = mgh = 600J

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