A bullet fired at a wooden block of thickness 0.15m manages to penetrate the block….

A bullet fired at a wooden block of thickness 0.15m manages to penetrate the block. If the mass of the bullet is 0.025kg and the average resisting force of the wood is 7.5 x 10³N, calculate the speed of the bullet just before it hits the wooden block.

Correct Answer: Option C

Explanation

F = ma
Therefore, a = (frac{F}{m})
a = (frac{7.5 times 10^{3}}{0.025})
a = 3 x 10⁵m/s²
using V² = U² + 2ax;
V² = 0² + (2 x 3 x 10⁵ x 0.15)
Therefore V = 300 m/s