Two cars P and Q starts from a point at the same time in a straight line and their positions are represents by xP(t)=at+bt2 and xQ(t)=ft−t2. At what time do the cars have the same velocity?
A
f−a2(1+b)
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B
a−f1+b
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C
a+f2(b−1)
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D
a+f2(1+b)
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