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