A motorcycle is capable of accelerating at 5.1 m/s starting from rest how far can it travell in 1.5 sec

The answer is 21m because the motion is in one dimension with constant acceleration.

The initial velocity is 0, because it started from rest, the acceleration ax is 4.7 m s2, and the time t is 3.0s

Plugging in our known values, we have

Δx = (0) (3.0s) + 12 (4.7 m s2) (3.0s) 2 = 21 m