A body of mass 1.5 kg is thrown vertically upwards with an initial velocity of 15 ms-1. What will be its potential energy at the end of 2 s? (Take, g = 10 m
Given, mass, m = 1.5 kg
Initial velocity, u = 15 m
Time, t = 2 s
From Newton’s second equation hf motion,
s = ut + 1/2 ${{gt}^{2}}$
=> s = 15 X 2 + — x10x 4 = 50 m
.’. Potential energy, PE = mgh
= 1.5x10x50 [-:h = s}
= 750J