Question

A stone of mass 2 kg attached to the
end of string of length 4.5m is whird in
a circle. The value of work done on it by
the string is​

Answer 1

Answer:

zero

• as throughout the motion the force which is acting is tension
• which is always acting perpendicularly in the direction of its motion...
• $work = fs \cos( \alpha )$
• angle is 90°here so..cos@=0
• work done is zero

hope it helps..

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