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

December 29, 2020 | education

| **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.