Work, Power and EnergyEasy
Question
A body is moved along a straight line by a machine delivering constant power. The distance moved by the body in time t is proportional to
Options
A.t1/2
B.t3/4
C.t3/2
D.t2
Solution
P = constnat
∴ Work done in time t.
W = Pt
From work-energy theorem, net work done is change in kinetic energy. Therefore,
mv2 = Pt
or v = t1/2
integrating, we get s = t3/2
∴ Work done in time t.
W = Pt
From work-energy theorem, net work done is change in kinetic energy. Therefore,
mv2 = Pt or v = t1/2
integrating, we get s = t3/2
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