Posted by **Jat** on Thursday, February 16, 2012 at 4:25am.

Starting simultaneously from the same spot, O, Alvin and Bernard set out across a field in the gog. Alvin travels with velocity i + 2 j m/s and Bernard with velocity 3i + j m/s, To avoid losing each other, they hold opposite ends of 90 m string.

a) At what speed alvin travels

b) Find the direction of travel of the two people and hence the angle between their path

c) Find the position vector OA and OB at t sesonds, and hence the vector AB at that time

d)Find the value of t for which the dtring become taut

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