Forces and Laws...

Two solid rubber balls A and B having masses 200 g and 400 g respectively are moving in opposite directions with velocity of A equal to 0.3 ms$$^{-1}$$. After collision the two balls come to rest then velocity of B is :

The speed-times relation of a car whose weight is $$1500kg$$ as shown in the given graph. How much breaking force has been applied at the end of $$7$$sec, to stop the car in $$2$$ sec?

Two bodies of masses $$m$$ and $$3m$$, moving with velocities $$3v$$ and $$v$$ respectively along same direction, collide with each other. After collision they stick together and move with a velocity $$V$$ in the same direction. Then:

A $$20 g$$ bullet passes through a plate of mass $$1 kg$$ and finally comes to rest inside another plate of mass $$2980 g$$. It makes the plates move from rest to same velocity. The percentage loss in velocity of bullet between the plate is:

A heavy uniform bar is being carried by two men on their shoulders. The weight of the bar is $$w$$. What is the work done by gravity?

Statement 1: When a man is standing on a stationary horizontal surface, the normal force exerted by the ground on him is equal and opposite to his weight.
Statement 2: According to Newton's $$3^{ rd }$$ law , every action has an equal and opposite reaction.

A bullet of mass $$20g$$ and moving with a velocity of $$200m/s$$ strikes a heap of sand and comes to rest after penetrating $$3cm$$ inside it. The force exerted by the sand on the bullet will be:

A rocket is moving at a constant speed in space by burning its fuel and ejecting out the burnt gases through a nozzle. Is there any force acting on the rocket? If yes, how much?

A force of $$5N$$ acts horizontally on a body of weight $$9.8N$$. What is the acceleration produced (in $${ ms }^{ -2 }$$)?

A body acted upon by a force $$F$$ has an acceleration $$A$$. When it is acted upon by two forces each of magnitude $$F$$ perpendicular to each other, its acceleration will be: