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Question

The speed v reached y a car of mass m, driven with constant power P (after travelling through a distance x and starting from rest), is given by:

A
v=3pxm
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B
v=(3pxm)12
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C
v=(3pxm)13
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D
v=(3pxm)2
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Solution

The correct option is A v=3pxm
Power =P Speed =V mass =m Distance covered =x
Power P=FV
=m.dvdt.v
=m.dvdx.dxdt.v.
pmdx=v2dv.
pmx=v33v=(3pxm)1/3

1474707_867259_ans_794f1f8b253d4e7bb3664603e26a7b6d.jpg

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