Question

Acceleration problems use the 4 Step method to solve each of the following. a wagon has a beginning speed of 10 km/hr and it reaches 75 km/hr in 7 sec

Answer 1

Vi = initial speed = 10 km/h

Vf= final speed = 75 km/h

t = time = 7 sec

a = acceleration

First, express km/h in m/s

Vi = 2.78 m/s

Vf= 20.83 m/s

Apply

a = (vf-vi) / t

replace:

a = (20.83 - 2.78 ) / 7 = 2.58 m/s^2