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Question
A body of mass m is thrown at an angle θ to the horizontal with the initial velocity u. Find the mean power developed by gravity over the whole time of motion of the body?
A body of mass m is thrown at an angle θ to the horizontal with the initial velocity u. Find the mean power developed by gravity over the whole time of motion of the body?
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Solution
The correct option is D Zero
The situation is shown in figure.
Mean power of gravity over the whole time of motion can be given as
Mean Power =Net gain in kinetic energyTotal time of motion
As we know that in projectile motion on horizontal plane, particle strikes the ground with the
same speed with which it was projected, kinetic energy of particle does not change hence from
initial point to final point there is no gain in kinetic energy.
Mean Power = 0
Zero
The situation is shown in figure.
Mean power of gravity over the whole time of motion can be given as
Mean Power =Net gain in kinetic energyTotal time of motion
As we know that in projectile motion on horizontal plane, particle strikes the ground with the
same speed with which it was projected, kinetic energy of particle does not change hence from
initial point to final point there is no gain in kinetic energy.
Mean Power = 0
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