A biker is riding at a constant velocity of 10 m/s. He then speeds up to 20 m/s in 2.5 seconds. What is his acceleration

Answer 1

20 m/s - 10 m/s = 10 m/s which is the change in velocity. The change in time is 2.5 sec. Acceleration is change in velocity divided by change in time.

10 m/s divided by 2.5 sec = 4 m/sec