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When will you say a body is in (i) uniform acceleration? (ii) non-uniform acceleration?
(i) Uniform acceleration:
When a body travels with the same velocity in the given time, then the acceleration is said to be uniform.
(ii) Non-uniform acceleration: When a body moves with unequal velocity in the equal interval of time, the body is said to be moving with non-uniform acceleration.
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 
Final speed of the bus, v = 60 km/h 
Time take to decrease the speed, t = 5 s
Here, the negative sign of acceleration indicates that the velocity of the car is decreasing.
A train starting from a railway station and moving with uniform acceleration attains a speed 40 km h−1 in 10 minutes. Find its acceleration?
Initial velocity of the train, u = 0 (since the train is initially at rest)
Final velocity of the train, v = 40 km/h 
Time taken, t = 10 min = 10 × 60 = 600 s
Hence, the acceleration of the train is 0.0185 m/s2.
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