Question

A bullet is moving with a velocity 20m/s. It strikes a target and comes to rest after penetrating a distance of 10 cm in the target. Calculate the resistive force offered by the target.

Answer 1

$\huge{\boxed{\boxed{\red{A}{N}{\blue{S}{\red{W}{\green{E}{R}}}}}}}$

Given:

• u = $\tt{20\:ms}^{-1}$
• v = $\tt{0}$
• s = $\tt{10 \: cm = 0.1 \: m}$

Let Retardation be $\tt{a}$

• $\tt{{v}^{2} = {u}^{2} - 2as}$
• $\tt{0 = {(20)}^{2} - (2 \times a \times 0.1)}$
• $\tt{a = \boxed{\tt{\frac{400}{2} {ms}^{-2}}}}$

• $\huge{\boxed{\boxed{\tt{200\:{ ms}^{-2}}}}}$

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