This video contains a brief animation and good analysis methods for illustrating projectile motion. The question is:
The quarterback Q throws the football when the receiver R is in the position shown. The receiver’s velocity is constant at 10 yd/sec, and he catches
passes when the ball is 6 ft above the ground. If the quarterback desires the receiver to catch the ball 2.5 sec after the launch instant shown, determine
the initial speed and angle required.

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