A machine gun has a mass of 10 kg.It fires 30 g bullets at the rate of 6 bullets per second with a speed of 400 m/s.What force must be applied to the gun to keep it in position ?

A cricket player catches a ball of mass 100 g and moving with a velocity of 25 ms^-1. If the ball is caught in 0.1s, the force of the blow exerted on the hand of the player is

A body is at rest on the surface of the earth. Which of the following statement is correct?

If the force on a rocket moving with a velocity of 300 m/s is 345 N, then the rate of combustion of the fuel ,is 

A certain force applied to a mass m₁ gives it an acceleration of 15 m/s² .The same force applied to a mass m₂ gives it an accelerationof 10 m/sec² .If the two masses are fixed together and the same force is applied to the combination ,find the acceleration.

A body of mass 2 kg ,moving on a horizontal surface with an initial velocity of 4 m/s , comes to rest after 2 s.If one wants to keep this moving on the same surface with a velocity of 4 m/s,the force required is

A lift is moving upward with increasing speed with acceleration 'a'.The apparent weight will be :

Physical independence of force is a consequence of 

A fireman wants to slide down a rope. The breaking load for the rope is 3/4^th of the weight of the man. With what minimum acceleration should the fireman slide down? Acceleration due to gravity is g. 

A shell is fired from a canon, it explodes in mid air, its total