Question

A car traveling at a speed of 35.0 m/s encounters an emergency and comes to a complete stop.

How much time will it take for the car to stop if it decelerates at -4.0 m/s²?

Answer 1

time will it take for the car to stop = 8.75 s

Step-by-step explanation:

The formula linking final velocity(v), initial velocity(u), acceleration(a) and time(t) is

v = u + at

The final velocity is 0 m/s since the car comes to a stop

Initial velocity u = 35 m/s

a = -4 m/s²

We have to find t

Plug in values

0 = 35 + (-4)t

-4t + 35 = 0

-4t = -35

t = -35/-4 = 8.75 s