SOLUTION :
Let aircraft have absolute velocity Vx and Vy in horizontal and vertical direction respectively to rendezvous with tanker air craft A in 2.9 min. , which is moving horizontally at V = 308 mi/h.
Aircraft speeds are usually in nautical miles per hour.
1 nautical miles = 6076.12 feet
Required relative velocity of B to A in horizontal direction
= distance / time
= 10170 / (2.9 / 60) feet/hour
= 210413.79 feet/hr
= 210413.79 / 6076.12 mi/hour
= 34.63 mi/hour
So,
Absolute Vx = 308 + 34.63 = 342.63
Relative velocity required for B to A in vertical direction
= distance / time
= 2330 / (2.9/60) feet/hour
= 48206.90 feet/hour
= 48206.90/6076.12 mi/hour
= 7.93 miles per hour
B has zero velocity in vertical direction.
So,
Absolute Vy = 7.83 + 0 = 7.93 mi/hour.
Hence absolute Velocity of B to meet A :
= V(B) = (342.63 I + 7.93 j) mi/hour (ANSWER).
After rendezvous, B should maintain the same speed as that of A
= 308 mi/hour in horizontal direction. (ANSWER).
Starting from the relative position shown, aircraft B is to rendezvous with the refueling tanker A....
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> Please read " 7.83 " as " 7.93 " wherever it appears.
Tulsiram Garg Sun, Sep 19, 2021 8:17 AM