The following figures show some velocity versus time curves. But only some of these can be reali...

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The following figures show some velocity versus time curves. But only some of these can be realised in practice. These are :
(a)
(c)
(A) Only \( a, b \) and \( d \)
(B) Only \( a, b, c \)
(C) Only \( b \) and \( c \)
(D) All of them
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