Mark kicked a 0.450 (kg) ball off a rooftop that is 81.0 (m) off the ground, at 15.0 (m/s) oriented 45.0° above his horizon. His friend, Joseph caught the ball from the window at a distant building that is 46.0 (m) off the ground. Joseph then releases the ball from the height and let the ball fall to ground. a. What is the speed of the ball before it reaches Joseph? b. What is the speed of the ball before it reaches the ground?

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Projectile Motion