Question

A car is travelling with a speed of 36km/h. the driver applies the brake and retards the car uniformly. the car is stopped in 5s. find(1) retardation of the car. (2) distance travelled before it is stopped after applying the brakes.can displacement be zero? if yes give example

Answer 1

first convert speed from km/he To m/s we get 10m/s as speed u=10 and t=5 then v=u+at so we know v=0 so a= -2m/S2 distance travelled is s=ut+1/2 at2 hence we get distance as 25 m displacement is zero when a person moves in a circle and returns to his initial point