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Q.

Speed-time graph of two cars A and B approaching towards each other is shown in figure. Initial distance between them is 60 m. The two cars will cross each other after time

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a

2s

b

3s

c

1.5s

d

2s

answer is B.

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Detailed Solution

Slope of v-t graph gives acceleration/retardation. |a|=5 m/s2 for both of them. A has acceleration while B has retardation.sA+sB=60or 12×5×t2+20t-12×5×t2=60 or t=3s
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