A motorcyclist starts from rest and reaches a speed of 6 m/s after travelling with uniform acceleration for 3 s. What is his acceleration?

We know, a= $\frac{v-u}{t}$

where, a is acceleration, v is the final velocity, u is the initial velocity and t is time.
v = 6 m/s
u = 0 m/s (as the body starts from rest)
t = 3s
a = ?
Substituting the values, we get, a = $\frac{6-0}{3}$= 2 m/s²
Therefore, the acceleration is = 2 m/s²