uniform
If speed time graph is a straight line parallel to the time axis, the object is moving uniformly.
Time taken, t = 2 minutes = 120 s
(a) v= u + at
v= 0 + 0.1 × 120
v= 12 ms–1
(b) According to the third equation of motion:
v2 - u2= 2as
Where, s is the distance covered by the bus
(12)2 - (0)2= 2(0.1) s
s = 720 m
Speed acquired by the bus is 12 m/s.
Distance travelled by the bus is 720 m.
If speed time graph is a straight line parallel to the time axis, the object is moving uniformly.
non-uniform
When the motion is non uniform, the distance time graph is not a straight line.It can be any curve.
Q. A bus starting from rest moves with a uniform acceleration of 0.1 m s−2 for 2 minutes. Find (a) the speed acquired, (b) the distance travelled.
Answer
Initial speed of the bus, u= 0
Acceleration, a = 0.1 m/s2Answer
Initial speed of the bus, u= 0
Time taken, t = 2 minutes = 120 s
(a) v= u + at
v= 0 + 0.1 × 120
v= 12 ms–1
(b) According to the third equation of motion:
v2 - u2= 2as
Where, s is the distance covered by the bus
(12)2 - (0)2= 2(0.1) s
s = 720 m
Speed acquired by the bus is 12 m/s.
Distance travelled by the bus is 720 m.
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