Question

the brakes applied to a car produced a negative acceleration of ms*-2 if the car takes to second to stop after applying the brakes calculate the distance travelled during this time

Answer 1

conaisering it ia starting its journey from rest:-

u=0 , a=-2 , t=2s ,

applying 2 eqn of motion
s=ut + at²/2
s=0×2 + (-2)(4)/2
s=-4
hence the distance traveled can't be negative ,

s=4m