How to calculate Acceleration?

Question

The makers of a certain automobile advertise that it will accelerate from 15 to 50 mph in 13 seconds. Find the acceleration in ft/s. Also find the distance the car travels in this time, assuming the acceleration to be constant.

Answer 1

First convert mph to ft/s. [15(5280)]/(60x60). Do the same for 50. Then use the formula vf = vi + at. Where vf is final velocity, vi is initial velocity, a is accleration and t is time.

For distance use vf^2 = vi^2 + 2ax where x is distance.

Answer 2

Tried to work it out, but the feet were unwashed so the smell made me give up!

Answer 3

v=u+at(formula)

v=final speed

u=initial speed

a=acceleration

t=time

50=15+a*13

a=35/13