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

The correct option is D $${-2 m/s^2}$$
In the given question 
u=20m/s
v=0m/s
t=10s
and 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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