Question

With distances measured in km and speeds in kmhh 1
, three ships are observed from the post guard station
at 1
2
hour intervals. They have the following displacement and velocity vectors:
s1 = 2i + 6j and v1 = 5i + 4j at 12 noon,
s2 = 6i + 9j and v2 = 4i + 3j at 12.30pm,
s3 = 11i + 6j and v3 = 2i + 7j at 1pm.

If the ships continue in the same direction, two of them will collide. Find the time of collision. If at that
instant the third ship changes course and then proceeds directly to the scene of collision at its original
speed, find at which time it will arrive

Answer 1