Question

give reason= (a)when a man jumps out of a boat to the bank of the river,the boat moves backwards.(b)all the cars are provided with seat belts(c)it is dangerous to jump out of the moving bus.

Answer 1

a. when a man jumps out of boat to the bank of river boat moves backwards, we can justify this by terming ,man jumping out of boat as an action and boat exerting an equal force to this as reaction.as we know according to the third law of motion to every action there is an equal and an opposite reaction

b. all the cars are provided with seatbelts as on the application of brakes,car slows down due to inertia and body continues to be set in motion.safety belts exert a force on body to slow down its forward motion

c.it is dangerous to move out of a moving bus as while in moving bus our body is in motion but when we jump then our feet come at rest. but the upper part is still in motion in forward direction and makes us fall down.