Question

A car going at 75 miles/hr slows down to 25 miles/hr in 2.5 sec; calculate the acceleration.

Answer 1

vi = initial speed = 75 miles/hour =167.7 m/s

vf = final speed = 25 miles/hour = 55.9234 m/s

t = time = 2.5 seconds=

a = acceleration

`a=(vf-vi)/(t)`

Replacing with the values given:

`a=(55.9234-167.7)/(2.5)`

a = 44.74 m/s^2