A drag racer starting from rest competes the quarter mile in 11.2 seconds. ?

Question

What was his average acceleration?

Using the Acceleration Equation Formula. ( Vf = Vo + a t )

Answer 1

0.25 mile in 11.2 s is equivalent to

1 mile in 11.2 * 4 = 44.8 s

So, in 1 minute it will travel 60 / 44.8 = 1.34 miles

and in 1 hour, 60 * 1.34 = 80.4 miles or 80.4 mph

If Vf = Vo + at

a = (Vf - Vo) / t

a = (80.4 - 0) / 11.2 = 7.2 mph / s