Explain the following:
$(i)$ Why is it dangerous to jump out of a moving vehicle? How can the danger be minimised?
$(ii)$ Why does a boatman push the water backward with the oars while rowing a boat?

(N/A) $(i)$ If a person jumps out of a moving vehicle,their feet will suddenly come to rest upon touching the ground,while the rest of the body remains in motion due to inertia. This causes the person to fall forward and potentially get hurt. This danger can be minimised by running along with the moving vehicle in the same direction for some distance after jumping out,which allows the body to come to rest gradually.
$(ii)$ When the boatman pushes the water backward with the oars,the water exerts an equal and opposite force on the boat in the forward direction,according to Newton's third law of motion. This reaction force helps the boat move forward.