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Question

A jet plane flying at a constant velocity v at a height=8 km is tracked by a radar R located at O directly below the line of flight. If angle θ is decreasing at rate of 0.025 rad/s, the velocity of plane when θ=60 is

A

1440 km/h
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B

960 km/h
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C

1920 km/h
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D

480 km/h
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