A weight lifter is holding a weight of 80 kg on his shoulder for 10 s. Work done by lifter is
Answers
Answer:
Work done by Wieghtlifter in holding 80kg for 2 minutes =0.
This is becuase the force applied by weightlifter results in no net displacement of 80kg mass W=Fdcosθ=0.
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Explanation:
Given data: A weight lifter is holding a weight of 80kg on his shoulder for 10s.
To Find: The work done by the lifter.
Solution:
An object that moves over a distance whenever a force is applied is called work done.
The formula for work done is, W = F× d
Here, W is the work done, F is the force, d is the distance or displacement.
Force = mass × acceleration due to gravity
Force = 80 kg×9.8 m/s²
Force= 784 kg m/s²
Work done = Force × displacement
Work done = 784 × 0
Work done = 0
The weight lifter did not move for 10s and just holding the weight, it is motionless and no work is done for 10s.
Therefore, the work done by the lifter is zero.