Question

A car traveling at 25 m/s starts to decelerate steadily. It comes to a complete stop in 10 seconds. What is Its acceleration?

Answer 1

Using the formula v = u + at where v = 0, u = 25 m/s, and t = 10 s,

0 = 25 + 10a 
10a = -25
a = -2.5 m/s^2