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zimbabwe

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a) Deteremine the magnitude and direction of the velocity of ship B relative to ship A.

b) What will be their distance of closest approach?

My Attempt for the first part

B Relative to A, first into compentents, so sin(60)*20=17.3 and cos(60)*20=10

Then relative to A

would be 10 km west and 30-17.3= 12.67 km south

however the actual answer is Velocity is 26.5 km/h in a direction South 41 degrees West.

How was i supposed to do it, and how do i start part b.