Question

A car starts from rest at a stop light and reaches 20 m/s in 3.5 s. Determine the acceleration of the car.


A)
3.5 m
s2



B)
5.7 m
s2



C)
20 m
s2



D)
70 m
s2

Answer 1

initial velocity: 0 m/s
final velocity: 20 m/s
time = 3.5s
acceleration=(final velocity-initial velocity)/time
a = (20-0)/3.5
a = 5.71 m/s^2

So B