EAMCET Engineering 2009 Solved Paper

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

→

v

A=2jms−1 and

→

v

B=2

^

i

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