A 2300. kg car starts from rest and accelerates uniformly to 24.0 m/s in 24.0 s. Assume that air resistance remains constant at 510 N during this time. Find (a) the net force on the car
b) the average power developed by the engine?
c) the instantaneous power output of the engine at t = 24.0 s, just before the car stops accelerating.
v=at
a=v/t =24/24=1 m/s²
ma=F-F(res)
F= ma+F(res) =2300•1+510=2810 N
P=W/t=F•s/t=F•v
inst P =F•v=2810•24=67440Watt
aveP=F• (v+v₀)/2=2810•24/2=33720 Watt