The bus, starting off, moves with a constant acceleration of 1.5 m / s2. How long does

The bus, starting off, moves with a constant acceleration of 1.5 m / s2. How long does it take for it to reach a speed of 54 km / h?

From the given we already know the following variables:
initial speed of body movement: V0 = 0 m / s;
required acceleration speed of the body: V = 54 km / h; we translate this value into m / s and we get 15 m / s;
acceleration: a = 1.5 m / s2.
The author asks to find the time (t) for which the bus will develop its speed from 0 m / s to 15 m / s.
Decision:
t = (V – V0) / a = (15 – 0) / 1.5 = 10 seconds.