Trigonometry problems

Question

An observer standing 4 km away from the launch pad of a rocket sees the rocket on the ground immediately before lift-off. After six seconds, the angle of inclination above the horizon at which he sees the rocket is 22-degrees.

a) What distance did the rocket travel vertically during the 6-seconds since lift-off?

b) What was the rocket's average speed over the six second interval?

c) If the rocket continues to rise at the same average speed, how high will it be above the ground after a total of 20-seconds of flight.

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Answer 1