Question

A bus decreases its speed from 80 km/h to 60
km/h in 5 s. Find the acceleration of the bus.
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Answer 1

$\huge\mathcal{\fcolorbox{cyan}{black}{\pink{ANSWER}}}$

Given,

initial velocity u = 80 km/h = (80 x 1000) / 3600

= 22.22 m/s

final velocity v = 60 km/h = 16.67 m/s

time t = 5 s

acceleration a = to find

We know that,

$v = u + at \\ \implies \: a \: = \frac{v - u}{t} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{16.67 - 22.22}{5} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = - 1.11 \: m {s}^{ - 2}$