A bus decreases its speed from 80 km h-1 to 60 km h-2 in 5 s. Find the acceleration of the bus.
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A bus decreases its speed from 80 km h-1 to 60 km h-2 in 5 s. Find the acceleration of the bus.

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Solution –

Change in velocity = (Final velocity - Initial velocity) = 60 km h-1 - 80 km h-1

= -20 km h-1 = -20,000 m/60×60s = -5.5 m s-1

Duration = 5 s

So, Acceleration = Change in velocity/Duration of time

= -5.5 m s-1/5s = 1.1 ms-1.

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