Question

a car is moving at rate of 72km/h and applies brake which provides retardation of 5ms-2 (i) how much time does the car takes to stop (ii) how much distance cover before coming a rest (iii ) what would be the stopping distance need if speed of a car is doubled ​

Answer 1

1. 4sec because here we use 1eq. V= U+at

2.40m we use third eq.