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Gravitational Force

A body of mas...

Question

A body of mass 2 kg is thrown vertically upwards with an initial velocity of 20 m/s. What will be its potential energy at the end of 2 s? Assume $g = 10 m / s^{2}$ .

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Solution

From the second equation of motion, $s = u t - \frac{1}{2} g t^{2}$
$= 20 \times 2 - \frac{1}{2} \times 10 \times 4 = 40 - 20 = 20 m$
So, potential energy at t = 2 s, P $= m g h = 2 \times 10 \times 20 = 400 J$

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