Question

When a car driver travelling at a speed of 20 m/s applies brakes and brings the car to rest in 40 s. then the acceleration will be
A. 2 m/s ^ 2
B. - 2 m/s ^ 2
C. - 0.5 m/s ^ 2
D.+0.5 m/s^ 2​

Answer 1

Answer:

acceleration = Velocity/ time

20/40 is the acceleration

1/2m/s² is the acceleration

Op.d +0.5 m/s² is the answer

Thank you

Answer 2

Answer:

-0.5m/s^2

Explanation:

v=u+at

0=20+a×40

0=20+40a

20+40a=0

40a=-20

a=-20/40

a=-1/2

a=-0.5m/s^2