Two particles start simultaneously from the same point and move along two straight lines, one with uniform velocity u and the other from rest with uniform acceleration f . Let α be the angle between t

Question

Two particles start simultaneously from the same point and move along two straight lines, one with uniform velocity u and the other from rest with uniform acceleration f . Let α be the angle between their directions of motion. The relative velocity of the second particle w.r.t. the first is least after a time.

TestHub · Accepted Answer

Using n C r ​ + n C r − 1 ​ = n + 1 C r ​ = n C r + 1 ​ + n ​ C r − 1 ​ + n C r ​ + n C r ​ = n C r + 1 ​ + n + 1 C r ​ + n C r ​ n + 1 C r + 1 ​ + n + 1 C r ​ ⇒ n + 2 C r + 1 ​

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