Question

# When a bus driver travelling at a speed of 20m/s applied brakes and brings the bus to rest in 10 seconds, then retardation will be

A
+2m/s2
B
+0.5m/s2
C
2m/s2
D
0.5m/s2

Solution

## The correct option is D $${-2 m/s^2}$$In the given question u=20m/sv=0m/st=10sand a=?we know the formula v =u + at so putting the values we get 0 = 20 + a X 10- 20 = 10 a-2 = a we get acceleration is -2 so retardation will be +2 m/ sec sq.Physics

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