Certain force acting on 40kg mass changes it's velocity from 5m/s to 2m/s.Calculate the work done by the force.
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according to the work energy theorem work done by a force on a moving body is equal to increase in kinetic energy
using the same above mentioned theorem,
work done=increase in k.e
=>1/2mv²-1/2mu²
=>1/2m(v²-u²)
=>1/2*40*(5²-2²)
=>20*21
=>420 j
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