Question

while bicycling you increase your velocity from 30 km/h to 35 km/h. In the next second, you go from 35 km/h to 40 km/h. What is your acceleration?

Answer 1

35km/h-30 km/h=5km/h=v
time=1 second
acceleration=v/t
5 x 3600/1000=18

18 m/s^2 is the acceleration

Answer 2

first time (1 s)
dv = 35 -30 = 5 km/h
second time (2s)
dv = 40 -35 = 5 km/h

put the data into:
acceleration = dv/time