Question

a body starts to slide over a horizontal surface with an initial velocity of 0.5m/s.due friction, its velocity decreases at the rate of 0.5m/s square .how much time will it take for the body to stop?

Answer 1

Data given:
                initial speed, u = 0.5 m/s
                acceleration, a = -0.5 m/$s^{2}$
                final speed, v = 0 m/s

Let the time be 't'

Using first equation of motion, we have:
                     v = u + at
                => t = $\frac{v-u}{a}$
                => t = $\frac{-0.5}{-0.5}$
                => t = 1s