A bicyclist starts from rest and accelerates at 4 m/s^2 for 3 seconds. The cyclist then travels for 20s at a constant speed. How far does the cyclist travel? I got 138 m but I'm not sure if I'm right?

Answer 1

the cyclist accelerates to 12 m/s (4 m/s^2 * 3 s)

20 s at 12 m/s is ? ... plus , distance during acceleration , 1/2 a t^2

more than twice what you figured