Question

An automobile traveling along a straight road increases its speed from 67 ft/s to 85 ft/s in 180 ft. If the acceleration is constant, how much time elapses while the auto moves the 180 ft? Answer in units of s.

Answer 1

t=2.5s

Step-by-step explanation:

You are given:

Initial speed Vi

Final Speed Vf

Distance travelled d

You must find time elapsed t

Use the kinematic equation that has most of these variables, in this case:

`d = (vi + vf)/(2) * t`

Substitute in:

`180 = (67 + 85)/(2) * t`

`t = 2.5s`