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find the work done by the force f and why change in kinetic energy is zero

find the work done by the force f and why change in kinetic energy is zero

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Grade:11

3 Answers

Sayani
13 Points
6 years ago
Without a suitable diagram it is difficult to identify which particular case this question deals with. a diagram is required.
 
Sayani
13 Points
6 years ago
oh sorry i failed to notice the attachment. Is FLcos theta your answer? work done should most probably be this
downey zer
73 Points
6 years ago
Since the process is gradual that means the object does not acquire any appreciable velocity int the process
Therefore change in KE of mass is equal to 0.
But gravity has done work on the object in the process which is =-mgl(1-cos(theta))
therefore the work done by the variable force is = +mgl(1-cos(theta)) for the total to be zero.

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