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Question

If a bus travelling at 20 m/s is subjected to a steady deceleration of 5 m/s2, how long will it take to come to rest ? 


Solution

Deceleration, a=$$-5m/s^2$$
 Initial velocity, u=$$20m/s$$
 Final velocity, v=$$0m/s$$
 t=? 

Using the equation:
$$t=\dfrac{v-u}{a}$$

$$t=\dfrac{0-20}{-5}$$

$$t=4\ s$$

Physics

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