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Kinetic Energy

A 1 kg body f...

Question

A 1 kg body falls freely under gravity. Find its momentum and kinetic energy 5 seconds after it starts falling. Take $g = 10 m s^{- 2}$ .

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Solution

Velocity after $5$ secs , $v = g t = 10 \times 5 = 50 m / s$
Mass of body , $m = 1 k g$

Momentum of body , $p = m v = 1 \times 50 = 50 k g m / s$

Kinetic energy of body , $K = \frac{1}{2} m v^{2} = \frac{1}{2} \times 1 \times 50^{2} = 1250 J$

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