A bus decreases its speed from 60 km/hr to 30 km/hr in 5 sec. Find the acceleration of the bus.

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Solution

$v = 30 k m / h r = \frac{150}{18} m / s, v = 60 k m / h r = \frac{300}{18} m / s, t = 5 s$
$a = \frac{v - u}{t}$
$a = \frac{(300 / 18) - (150 / 18)}{5} = 1.66 m / s^{2}$

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