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