Question 2
A bus decreases its speed from $80 k m h^{- 1} t o 60 k m h^{- 1}$ in 5 s. Find the acceleration of the bus.

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Solution

Initial speed of the bus, $u = 80 k m / h = 80 \times \frac{5}{18} m / s = 22.22 m / s$
Final speed of the bus, $v = 60 k m / h = 60 \times \frac{5}{18} m / s = 16.66 m / s$
Time taken to decrease the speed, t = 5 s
Acceleration, $a = \frac{v - u}{t} = \frac{16.66 - 22.22}{5} = - 1.112 m / s^{2}$

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