What is the $SI$ unit of force?

$A$ passenger in a moving train tosses a coin which falls behind him. It means that the motion of the train is

$A$ cricket ball of mass $70 \, g$,moving with a velocity of $0.5 \, m s^{-1}$ is stopped by a player in $0.5 \, s$. What is the force applied by the player to stop the ball (in $, N$)?

The $SI$ unit of force is

If a body experiences a net zero unbalanced force, then the body:

For a $2 \ kg$ mass,the $v-t$ graph is given. Find the force experienced by the mass in $OA$,$AB$,and $BC$.