A lift of mass $200 \mathrm{kg}$ is moving upwards with an acceleration of $4{ \mathrm{ms}}^{-2}$. What will be the tension of the rope of the lift? If the lift moves downwards with the same acceleration, what will be the tension of the rope? $g=9.8 \mathrm{m}/{\mathrm{s}}^2$

Two bodies $A$ and $B$ of masses $100 \mathrm{gm}$ and $400 \mathrm{gm}$ respectively are moving towards each other with speeds $100 \mathrm{cm}/\mathrm{s}$ and $10 \mathrm{cm}/\mathrm{s}$. They suffer a head-on collision and stick together.

In which direction will the combined mass move after the collision,

Two bodies $A$ and $B$ of masses $100 \mathrm{gm}$ and $400 \mathrm{gm}$ respectively are moving towards each other with speeds $100 \mathrm{cm}/\mathrm{s}$ and $10 \mathrm{cm}/\mathrm{s}$. They suffer a head-on collision and stick together.

What will be the distance travelled by the combined mass after $10 s$,

Two bodies $A$ and $B$ of masses $100 \mathrm{gm}$ and $400 \mathrm{gm}$ respectively are moving towards each other with speeds $100 \mathrm{cm}/\mathrm{s}$ and $10 \mathrm{cm}/\mathrm{s}$. They suffer a head-on collision and stick together.

assuming the two bodies to be originally at the same temperature and specific heat of both the bodies to be $0.1 \mathrm{Joule}/\mathrm{Kg}/\mathrm{C}$, calculate the rise in temperature of the combined mass after the collision.