Forces and Laws...

A force of 2 N is applied on a particle for 2 sec, the change in momentum will be -

A trolley of mass $$300 kg$$ carrying a sandbag of $$25 kg$$ is moving uniformly with a speed of $$27 km/h$$ on a frictionless track. After a while, sand starts leaking out of a hole on the trolley's floor at the rate of $$0.05 kg/s$$. The speed of the trolley after the entire sand bag is empty is

A bullet of mass 25 g is fired from a rifle of mass 2 kg. Imagine that no other force are acting on the system. If the bullet travels with a velocity of 2 $${ ms }^{ -1 }$$ what will be the velocity of the recoil of the rifle ?

A gun of weight of $$10 \,kg$$ fires a shot of $$0.5 \,g$$ with a velocity $$230 \,m/s$$. Velocity of recoil gun is-

A simple pendulum hangs from the roof of a moving train. The string is inclined towards the rear of the train. What is the nature of the motion of the train?

A gun fires a bullet of mass 50 g with a velocity of $$ 30 ms^{-1} $$. Because of this,the gun is pushed back with a velocity of $$ 1 ms^{-1} $$. The mass of the gun is.

A gun recoils after firing to conserve:

An athlete runs some distance before taking a long jump, because:

The momentum of a body of given mass is proportional to its:

The acceleration of a body is to be doubled from its initial value. By what factor is the acting force to be increased ?