Class 11PhysicsWork, Energy, Power and CollisionWork Energy Theorem and Conservation of Mechanical Energy
EasyWhat can be said about the law of conservation of energy?
- AEnergy cannot be destroyed but it can be created.
- BEnergy can neither be created nor destroyed.
- CEnergy can be destroyed but it cannot be created.
- DEnergy can be both created and destroyed.
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$A$ car comes to rest after traveling a distance $s$ under a constant retarding force $F$. If the mass of the car is increased by $50\%$,at what distance will the car come to rest,assuming the same retarding force $F$ and initial velocity $v$?
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View Solution$A$ particle is released from a height $H$. At a certain height $h$,its kinetic energy is two times its potential energy. The height $h$ and the speed $v$ of the particle at that instant are:
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View SolutionThe velocity-time graph for a body of mass $10\, kg$ is shown in the figure. The work done on the body in the first two seconds of the motion is ................ $J$.
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View SolutionThe work-energy theorem is valid in the presence of:
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