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The graph between kinetic energy EK and velocity V is

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Important Questions on Work, Energy and Power

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A body of mass 2 kg falls from a height of 20 m. What is the loss in potential energy?
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In stretching a spring by 2 cm energy stored is given by U, then stretching by 10 cm energy stored will be :-
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If the potential energy of two molecules is given by 
U=Ar12-Br6, then at the equilibrium position, its potential energy is equal to
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Water is falling on the blades of a turbine at a rate of 100 kg/s from a certain spring. If the height of the spring be 100 metres, the power transferred to the turbine will be :-
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The potential energy of spring when stretched by a distance x is E. The energy of the spring when stretched by x/2 is -
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A boy of mass 50 kg jumps to a height of 0.8 m from the ground then momentum transferred by the ground to boy is : 
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Two particles of masses m1, m2 move with initial velocities u1 and u2. On collision, one of the particles get excited to higher level after absorbing energy ε . If final velocities of particles be v1 and v2, then we must have,
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Assertion : A particle moving one dimensionally in conservative field may have more than one turning points.  
Reason : Turning point depends on initial velocity.