Quadratic Equations / Projectile Motion

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Mathematics

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1. Which equation would best help solve the following problem: Rita hits a tennis ball with an initial velocity of 15 meters/sec. When she hits the ball, it is one meter above the ground. How long will it take for the ball to hit the ground? 2. Which equation would best help solve the following problem: Sandy releases a javelin 1.6 meters above the ground with an initial vertical velocity of 25 meters per second. How long will it take the javelin to hit the ground? 3. Which equation would best help solve the following problem: Petra throws a ball up with an initial velocity of 35 feet per second from a platform that is at ground level. How long will it take the ball in the air? 4. Which equation would best help solve the following problem: Rennie kicks a field goal with an initial vertical velocity of 31 meters per second. How long will it take the football to hit the ground? 5. Ted throws an object into the air with an initial vertical velocity of 54 feet per second from a platform that is 40 feet above the ground. About how long will it take the object to hit the ground?
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