A ball is thrown horizontally from the top of a 68.5-m building and lands 112.3 m from the base of the building. Ignore air resistance. (Assume the ball is thrown in the +x direction and upward to be in the +y direction.) (a) How long (in s) is the ball in the air? 4.78 (b) What must have been the initial horizontal component of the velocity (in m/s)? (Indicate the direction with the sign of your answer.) 23.5 m/s (c) What is the vertical component of the velocity (in m/s) just before the ball hits the ground? (Indicate the direction with the sign of your answer.) 14.3 |× m/s (d) What is the velocity (in m/s) (including both the horizontal and vertical components) of the ball just before it hits the ground? |× m/s X ° counterclockwise from the +x-axis magnitude 27.5 direction 31.4

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Projectile Motion