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Third Equation of Motion

A bus decreas...

Question

A bus decreases its speed from 80 km/h to 60 km/h in 5 seconds. Find the acceleration of the bus.

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Solution

$u$ = initial velocity = $80 k m / h$ = $22.2 m / s$
$v$ = final velocity = $60 k m / h$ = $16.7 m / s$
$t$ = time = $5 s$
$a$ = acceleration = ?

$a$ = $\frac{v - u}{t}$
$a$ = $\frac{16.7 - 22.2}{5}$
Therefore, $a$ = $- 1.1 m / s^{2}$

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