A car of mass m starts from rest and accelerates so that instantaneous power delivered to the car has a constant magnitude P. The instantaneous velocity of the car is proportional to??
Ans t ^1/2
how to solve??

Hint: recall that power is defined as change in energy per unit time. Take a stab at this, and post back with what you come up with.

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Originally Posted by ebaines

Hint: recall that power is defined as change in energy per unit time. Take a stab at this, and post back with what you come up with.

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1/2 mv ²= Pxt.. thus v is proportional to under root of t.. Right?

Yes - that's it.