Work Energy And Power Question 257

Question: A car of mass m starts from rest and accelerates so that the instantaneous power delivered to the car has a constant magnitude pg. The instantaneous velocity of this car is proportiourl to:

Options:

A) t2po

B) t1/2

C) t1/2

D) tm

Show Answer

Answer:

Correct Answer: B

Solution:

[b] Constant power of car P0=F.V=ma.v

P0=mdvdt.v

P0dt=mvdv Integrating P0.t=mv22v=2P0tm

  P0, m and 2 are constant

vt



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