The velocity of a particle of mass 20g has been changed from 10 Cm/sec to 5cm/sec due to some external force.The work done by force?
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The work done is equal to the change in kinetic energy.
Ke2 - Ke1
Ke1 = 1/2×mu^2
= 1/2×0.02×0.1
= 1× 0.01 ×0.1
= 0.001 J
Ke2 = 1/2×mv^2
= 1/2×0.02×0.05
= 1×0.01×0.05
= 0.0005 J
Work done = 0.0005 - 0.001
= - 0.095J
YOU NEED TO CONVERT cm INTO m AND g TO kg.
HERE M IS MASS, U IS INITIAL VELOCITY NAD V IS FINAL VELOCITY
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