The rocket is fi red vertically and tracked by the radar station shown. When reaches 60,

The rocket is fi red vertically and tracked by the radar station shown. When θ reaches 60°, other corresponding measurements give the values r = 9 km, r¨ = 21m/s², and θ˙ = 0.02 rad/s. Calculate the magnitudes of the velocity and acceleration of the rocket at this position.

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a Problem 2/147