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# A bus decreases its speed from 80 km h^(−1) to 60 km h^(−1) in 5 s. Find the acceleration of the bus. - CBSE Class 9 - Science

ConceptRate of Change of Velocity

#### Question

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

#### Solution

Initial speed of the bus, u = 80 km/h= 80xx5/18=22.22" m/s"

Final speed of the bus, v = 60 km/h= 60xx5/18=16.66" m/s"

Time take to decrease the speed, t = 5 s

"Acceleration, "a=(v-u)/t=(16.66-22.22)/5=-1.112" m/s"^2

Here, the negative sign of acceleration indicates that the velocity of the car is decreasing.

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Solution A bus decreases its speed from 80 km h^(−1) to 60 km h^(−1) in 5 s. Find the acceleration of the bus. Concept: Rate of Change of Velocity.
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