Question

7. A car traveling at 17.3 m/s starts to decelerate steadily. It comes to a complete

stop in 11 seconds. What is it's acceleration?

Answer 1

-1.57 m/²

Step-by-step explanation:

The equation is

v = u + at

where v = final velocity, u = initial velocity, a = acceleration, t = time

We can manipulate the final velocity equation to get

a = (v - u)/t

Final velocity v = 0, u = 17.3 m/s, t = 11s

a = (0 - 17.3)/11 = -17.3/11 = -1.57 m/²

Negative value means it is deceleration since speed is decreasing