VITEEE 2009 Paper

Two persons A and B are located in X-Y plane at the points (0,0) and (0,10) respectively. (The distance are measured in MKS unit). At a time t = 0, they start moving simultaneously with velocities

→

v

a=2

^

j

ms−1 and

→

v

b=2

^

i

ms−1 respectively. The time after which A and B are at their closest distance is