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

Question 40 Exercise

A body of mass 2kg is thrown vertically upwards with an initial velocity of 20 m/s. What will be its potential energy at the end of 2s?

Answer:

Mass of the body, m = 2kg

Initial velocity, u = 20 m/s

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

Height reached = h

Time, t = 2 s

Using second equation of motion,

h = ut = 1/2 gt^2

h = 20m

PE after 2 s = mgh = 400J

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