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If a ball is thrown off the roof with a starting velocity of 10 mph and hits the ground at a final velocity of 30 mph, what is the average velocity of its descent?

A 20 mph

The equation is: Average velocity = (final velocity + initial velocity) \u00F7 2 Fill in the appropriate values: Average velocity = (30 mph + 10 mph) \u00F7 2 Simplify: Average velocity = 40 mph \u00F7 2 = 20 mph