Question

A car travelling at 15 m/s increases it's speed to 20 m/s in 10 seconds. its average acceleration is?

Answer 1

Ave. acceleration = change in velocity/ time  =  (vf-vi)/t
vf = final velocity= 20m/s
vi = Initial velocity = 15m/s
t = time = 10sec.
So, the ave. acceleration is = (20 m/s -15 m/s)/10 sec
                                            = 5 m/s / 10 sec
                                            = 1/2  m/s²  or 0.5 m/s²