Question

# A car is moving with a velocity $$20 \ m s^{-1}$$. The brakes are applied to retard it at a rate of $$2\ m s^{-2}$$. What will be the velocity after $$5 s$$ of applying the brakes?

A
30ms1
B
2.5ms1
C
5ms1
D
10ms1

Solution

## The correct option is D $$10 m s^{-1}$$Acceleration, $$a = \dfrac{v_{final}-v_{initial}}{Time}$$Therefore, $$-2 m/s^2 = \dfrac{v_{final}-20 m/s}{5 s}$$$$v_{final} = 10 m/s$$Physics

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