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. $+2m/s^2$
• B. $+0.5m/s^2$
• C. $-2m/s^2$
• D. $-0.5m/s^2$

Answer 1

Answer: (C)

$-2m/s^2$

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.