Eduprobe
Question:
A car of mass m starts from rest and accelerates so that the instantaneous power delivered to the car has a constant magnitude P0. The instantaneous velocity of this car is proportional to?
t/√m
t1/2
t2P0
t/2
Solution:
P0=F.v=mav
P0=mvdv/dt
∫mvdv=∫P0dt
mv²/2=P0t
v∝√t