Questions in Laws of Motion

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An object with a mass 10 kg moves at a constant velocity of 10 m/sec. A constant force then acts for 4 second on the object and gives it a speed of 2 m/sec in opposite direction, the impulse acting on the object is
A machine gun is mounted on a 2000 kg car on a horizontal frictionless surface. At some instant the gun fires bullets of mass 10 gm with a velocity of 500 m/sec with respect to the car. The number of bullets fired per second is ten. The average thrust on the system is
In the above question, the acceleration of the car will be
A person is standing in an elevator. In which situation he finds his weight less than actual when
A particle of mass 0.3 kg is subjected to a force $F = - kx$ with $k = 15\,N/m.$ What will be its initial acceleration if it is released from a point 20 cm away from the origin
A block of metal weighing 2 kg is resting on a frictionless plane. It is struck by a jet releasing water at a rate of 1 kg/sec and at a speed of 5 m/sec. The initial acceleration of the block will be
Gravels are dropped on a conveyor belt at the rate of 0.5 kg/sec. The extra force required in newtons to keep the belt moving at 2 m/sec is
A parachutist of weight ‘w’ strikes the ground with his legs fixed and comes to rest with an upward acceleration of magnitude 3 g. Force exerted on him by ground during landing is
At a place where the acceleration due to gravity is $10\,m\,{\sec ^{ - 2}}$ a force of 5 kg-wt acts on a body of mass 10 kg initially at rest. The velocity of the body after 4 second is
In a rocket of mass 1000 kg fuel is consumed at a rate of 40 kg/s. The velocity of the gases ejected from the rocket is $5 \times {10^4}\,m/s$. The thrust on the rocket is

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