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question_answer1) A person is sitting in a travelling train and facing the engine. He tosses up a coin and the coin falls behind him. It can be concluded that the train is
question_answer2) A bullet of mass 0.1 kg ks fired with a speed of 100 m/s, the mass of gun 50 kg. The velocity of recoil is
question_answer3) 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?
question_answer4) A vehicle of 100 kg is moving with a velocity of 5m/ s. To stop it in 1/10 s, the required force in opposite direction is :
question_answer5) A ship of mass \[\text{3}\times \text{1}{{0}^{\text{7}}}\] kg, initially at rest, is pulled by a force of \[\text{5}\times \text{1}{{0}^{\text{4}}}\] through a distance of 3m. Assuming that the resistance due to water is negligible, the speed of the ship is :
question_answer6) A block of metal weighting 2 kg is resting on frictionless plane. It is struck by a jet releasing water at a rate struck by a jet releasing water at a rate of 1 kg/s and at a speed of 5 m/s. The initial acceleration of the block is :
question_answer7) The average force that is necessary to stop a hammer with a momentum of 25 Ns in 0.05 s, is about
question_answer8) A ball of mass 100 g is moving with a velocity of 10 m/s and hits a bat and rebounds with a velocity of 10 m/s. The force of the blow by the bat acts for 0.01 s. The average force exerted on the ball b the bat is
question_answer9) A vehicle of mass 120 kg is moving with a uniform velocity of 108 km/h. The force required to stop the vehicle in 10s is :
question_answer10) A body of mass 2 kg collides with a wall with speed 100 m/s and rebounds with the same speed. If the time of contact was 1/50 s, the force exerted on the wall is:
question_answer11) In a rocket of mass 1000 kg fuel is consumed at a rate of 40 kg/s. The velocity of the gas ejected from the rocket is \[\text{5}\times \text{1}{{0}^{\text{4}}}\] m/s. The thrust on the rocket is
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