Question

A driver of a car traveling at 15.9 m/s applies the brakes, causing a uniform deceleration of 2.5 m/s2 How long does it take the car to accelerate to a final speed of 10.2 m/s? Answer in units of s

i don't know

Answer 1

`"2.28 s"`

Explanation:

Use equation of motion,

`v = u + at`

`t = (v - u)/a = ("10.2 m/s" - "15.9 m/s")/(-"2.5 m/s²") = "2.28 s"`