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detailed solution type written much better need it now thanks Christopher is using a telescope to observe a rocket that rose vertically at a point

detailed solution type written much better need it now thanks

Christopher is using a telescope to observe a rocket that rose vertically at a point 20 kilometers away. The angle between the telescope and the ground is changing at a rate of 0.5 rad/min. What is the rocket's velocity if at a certain moment, the angle between the ground and the telescope is Z?

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