Question

A driver applies the brake and slow down the velocity of the bus from 80km/h to 60km/h in 5 second . calcute the acceleration of the bus.

Answer 1

HEYA!
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Initial velocity u, = 60 km/hr

$= 60 \times \frac{5}{18} = \frac{300}{18} = 16.6ms {}^{ - 1}$
Final velocity v = 80 km/hr

$= 80 \times \frac{5}{18} \\ \\ = 22.2ms {}^{ - 1}$

Now , using the formula ,

$a = \frac{v - u}{t}$

$a = \frac{22.2 - 16.6}{5} \\ \\ = \frac{ 5.6}{5} = \frac{ 56}{50} \\ \\ = 1.12ms {}^{ - 2}$
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