1.

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»

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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