Questions in Laws of Motion

Select	Question
	A wagon weighing 1000 kg is moving with a velocity 50km/h on smooth horizontal rails. A mass of 250 kg is dropped into it. The velocity with which it moves now is
	If a force of 250 N act on body, the momentum acquired is 125 kg-m/s. What is the period for which force acts on the body
	A 100 g iron ball having velocity 10 m/s collides with a wall at an angle 30° and rebounds with the same angle. If the period of contact between the ball and wall is 0.1 second, then the force experienced by the wall is
	A ball of mass 150g starts moving with an acceleration of $20m/{s^2}$. When hit by a force, which acts on it for 0.1 sec. The impulsive force is
	A body, whose momentum is constant, must have constant
	The motion of a rocket is based on the principle of conservation of
	A rope of length 5m is kept on frictionless surface and a force of 5N is applied to one of its end. Find tension in the rope at 1m from this end
	An aircraft is moving with a velocity of $300\,m{s^{ - 1}}.$ If all the forces acting on it are balanced, then
	A rocket of mass 1000 kg exhausts gases at a rate of 4 kg/sec with a velocity 3000 m/s. The thrust developed on the rocket is
	The momentum is most closely related to