The material point was moving at a speed of 72 km / h, after 5 seconds it stopped. Determine the path traveled in 5 seconds.

Vo = 72 km / h = 20 m / s. V = 0 m / s. t = 5 s.
S -?
For movement with constant acceleration, the following formula is valid: S = Vo * t – a * t ^ 2/2. Let’s find the acceleration from the formula: a = (V – Vо) / t. a = (0 m / s – 20 m / s) / 5 s = – 4 m / s ^ 2. S = 20 m / s * 5 s – 4 m / s ^ 2 * (5 s) ^ 2/2 = 50 m.
Answer: the body has passed the path S = 50 m. The sign “-” means that the acceleration is directed against the motion, the body is decelerated.