A car acclerates from 0 to 60 mi/h in 3.9 seconds. what is the magnitude of avg. acceleration of car in m/s^2?

Question

A car acclerates from 0 to 60 mi/h in 3.9 seconds. what is the magnitude of avg. acceleration of car in m/s^2?

Answer 1

The conversion factor for miles per hour and meters per second is:

1 mile per hour = 0.44704 meters per second

60 mi/hr x 0.44704 = 26.8224 m/s

a = ∆v / ∆t = (27 m/s - 0 m/s) / 3.9 s = 6.9 m/s²

Answer 2

1 miles per hour = 1/2.23693629 meter per second

60 miles per hour = 26,8224 meter per second

so

a (acceleration) = Δv (change in velocity) / Δt (change in time)

=26,8224 / 3,9 = 6,877538468 m/s^2 ≈ 6,9 m/s^2