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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?

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Mass of the body, m = 2kg 

Initial velocity, u = 20 m/s 

Acceleration due to gravity, g = 10 m/s2 

Height reached = h 

Time, t = 2 s 

Using second equation of motion, 

h = ut = 1/2 gt

h = 20m 

PE after 2 s = mgh = 400J

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