Question

Find the momentum of a body of mass 100g having a kinetic energy of 20J.

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Answer 1

Here..

mass (m) = 100 g

=> $\dfrac{100}{1000}$

=> 0.1 kg

kinetic energy (K.E) = 20 J

Now..

Kinetic Energy = $\dfrac{1}{2}$ mv²

20 = $\dfrac{1}{2}$ × 0.1 × v²

20 = $\dfrac{1}{2}$ × $\dfrac{1}{10}$ × v²

20 × 20 = v²

v² = 400

v = √400

v = 20 m/s

$\textbf{Momentum (P) = mv}$

=> 0.1 × 20

=> $\textbf{2 kg m/s}$