The action-reaction forces:

If action is always equal to the reaction,explain,why a cart pulled by a horse can be moved.

If action is always equal to the reaction,explain how a horse can pull a cart.

$A$ jet engine works on the principle of Newton's:

$A$ bullet of mass $10 \, g$ is fired with a velocity of $400 \, m s^{-1}$ from a gun of mass $4 \, kg$. What is the recoil velocity of the gun (in $, m s^{-1}$)?

If someone jumps to the shore from a boat,the boat moves in the opposite direction. Explain.