The time taken by a train to slow down from 80 kmh-1 to 20 kmh-1 with a uniform deceleration of 2 ms-2 is

The time taken by a train to slow down from 80 kmh-1 to 20 kmh-1 with

1.	The time taken by a train to slow down from 80 kmh-1 to 20 kmh-1 with a uniform deceleration of 2 ms-2 is
A.	9 s
B.	10 s
C.	8.3 s
D.	8.4 s
Answer» D. 8.4 s