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Q.

Ship A is travelling with a velocity of 5 kmh-1 due east. A second ship is heading 30° east of north. What should be the speed of second ship if it is to remain always due north with respect to the first ship?

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a

7 kmh−1

b

8 kmh−1

c

10 kmh−1
 

d

9 kmh−1

answer is A.

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Detailed Solution

For B always to be north of A, the velocity components of both along east should be same.v2cos 60° = v1, v2= 10 kmh−1

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