A body of mass 2 kg moving on a horizontal surface with initial velocity of 4 m $s^{-1}s^\{-1\}$ comes to rest after two seconds. If one wants to keep this body moving on the same surface with a velocity of 4 m $s^{-1}s^\{-1\}$ , the force required is

What force will change the velocity of a body of mass 1 kg from 20 m $s^{-1}s^\{-1\}$ to 30 m $s^{-1}s^\{-1\}$ in two seconds?

A force of 5 newton acts on a body of weight 9.80 newton. What is the acceleration produced in $m\mathrm{/}{s}^{2}m/s^2$ ?

A body of mass m strikes a wall with velocity v and rebounds with the same speed. Its change in momentum is

A force of 6 N acts on a body of mass 1 kg initially at rest and during this time, the body attains a velocity of 30 m/s. The time for which the force acts on a body is

A bullet of mass 10 g is fired from a gun of mass 1 kg with recoil velocity of gun = 5 m/s. The muzzle velocity will be

The velocity of rocket with respect to ground is $v_{1}v\_1$ and velocity of gases ejecting from rocket with respect to ground is $v_{2}v\_2$ Then velocity of gases with respect to rocket is given by

Two bodies A and B of masses 1 kg and 2 kg moving towards each other with velocities 4 m/s and 1 m/s suffers a head on collision and stick together. The combined mass will

Which of the following has maximum momentum?

A bullet hits and gets embedded in a solid block resting on a horizontal frictionless table. What is conserved?