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question_answer1) A body of mass 2 kg is thrown up vertically with a K.E. of 490 J. If the acceleration due to gravity is \[\text{9}.\text{8 m}{{\text{s}}^{-\text{2}}}\], the height at which the K.E. of the body becomes half of the original value is
question_answer2) A motor boat is having a steady speed of 20 m/s. If the water resistance to the motor boat is 600 N, then the power is
question_answer3) The power of a pump which can pump 100 kg of water in 10 s to a height of 100 m is
question_answer4) The K.E. of a body of mass 1 kg and momentum 2 N-s is
question_answer5) Two bodies of masses\[{{m}_{1}}\]and\[{{m}_{2}}\] have equal momenta. Their kinetic energies are in the ratio of
question_answer6) The bodies of masses 2m and m have their kinetic energies in the ratio 8:1. Then the ratio of their momenta is
question_answer7) An electric motor exerts a force of 40 N on a cable and pulls its distance of 30 m in one minute. The power supplied by motor in watt is
question_answer8) Two bodies of masses 1 m and 4 m have the same K.E. What is the ratio for their momenta.
question_answer9) Two bodies of masses 2 kg and 3, kg have same momenta. K.E. of 3 kg mass is 10 J. then K.E. of 2 kg mass is
question_answer10) The power of a pump which can pump 200 kgs of water to a height of 200 m in 10 s is (\[\text{g}=\text{1}0\text{ m}/{{\text{s}}^{\text{2}}}\])
question_answer11) A simple pendulum hanging freely and at rest is vertical because in that position.
question_answer12) An elevator is designed to lift a load of 1000 kg through 6 floors of a building averaging 3.5 m per floor in 6 s. The power of the engine of the elevator neglecting the other losses is given by
question_answer13) A body of mass 0.1 kg is dropped from a height of 10 m at a place where \[\text{g}=\text{1}0\text{ m}/{{\text{s}}^{-\text{2}}}.\]Its K.E. just before it strikes the ground is
question_answer14) If K.E. of a given particle is doubled, its momentum will be
question_answer15) If the velocity of a car is trebled its K.E. is
question_answer16) Two balls of different masses have the same kinetic energy. Then the
question_answer17) A stone is projected vertically up to reach a maximum height h. The ratio of its K.E. to P.E, at a height\[\frac{4h}{5}\]will be
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