In One Contest At The County Fair A Spring Loaded Plunger Launches A Ball At A S

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In one contest at the county fair, a spring-loaded plunger launches a ball at a speed of 4.50 m/s from one corner of a smooth, flat board that is tilted up at a 20^circ angle. To win, you must make the ball hit a small target at the adjacent corner, 2.42 m away. At what angle theta should you tilt the ball launcher?

 
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