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Work-Energy Theorem

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2025 1 question

The kinetic energies of two similar cars A and B are $100\text{ J}$ and $225\text{ J}$ respectively. On applying brakes, car A stops after $1000\text{ m}$ and car B stops after $1500\text{ m}$. If $F_A$ and $F_B$ are the forces applied by the brakes on cars A and B, respectively, then the ratio $F_A / F_B$ is:

2023 1 question

A bullet from a gun is fired on a rectangular wooden block with velocity $u$. When bullet travels $24\ cm$ through the block along its length horizontally, velocity of bullet becomes $\frac{u}{3}$. Then it further penetrates into the block in the same direction before coming to rest exactly at the other end of the block. The total length of the block is: