Laws of Motion

A box of mass $5 \mathrm{kg}$ is pulled by a cord, up along a frictionless plane inclined at $30°$ with the horizontal. The tension in the cord is $30 \mathrm{N}$. The acceleration of the box is (Take$\mathrm{g}=10{ \mathrm{ms}}^{-2}$ ):

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

[NEET 2025]