A car is driving 75.0 km/h [N] when it notices a stalled car 40.8 m directly ahead of him. The car applies the brakes, coming to a stop just in time to avoid a collision. The brakes provid a constant acceleration of 4.80 m/s^2 . What is the reaction time?
our acceleration is 4.80 m/s^2
out initial velocity is 75.0 km/h or 20.8 m/s
our final velocity is 0 m/s
and our displacement is 48.0 m
We are trying to solve for time
apply this data to an equation of t = v / a = 20.8 / 4.8 = 4.3 s
if you apply this data to the equation of t = (2/v) * d = (2 / 20.8) * 48.0 = 4.62 s
What am I doing wrong?
our acceleration is 4.80 m/s^2
out initial velocity is 75.0 km/h or 20.8 m/s
our final velocity is 0 m/s
and our displacement is 48.0 m
We are trying to solve for time
apply this data to an equation of t = v / a = 20.8 / 4.8 = 4.3 s
if you apply this data to the equation of t = (2/v) * d = (2 / 20.8) * 48.0 = 4.62 s
What am I doing wrong?