21. Given below are some speed-time graphs.
In which of the graphs
Speed
Speed
Speed
O Time
O Time-
(i)
0 Time
(ii)
23.
Speed
Speed
0 Time
O Time
(iv)
(v)
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Answer:
Answer
(i) OA represents uniform acceleration
(ii) AB represents constant speed.
(iii) BC represents uniform retardation.
(iv) Acceleration of car from O to A= slope of line OA
a=
10−0
40−0
=4m/s
2
(v) Acceleration of car from A to B is zero as it has uniform speed during this time.
(vi) Retardation of car from B to C= slope of line BC
a=
50−30
0−40
=
20
−40
=−2m/s
2
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