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A dog's owner throws a tennis ball from a point 1.5 m above the ground with an initial speed of 12.7 at an angle

A dog's owner throws a tennis ball from a point 1.5 m above the ground with an initial speed of 12.7 at an angle 31.5 above the horizontal. The dog jumps to catch the ball as it returns to the same height above the ground from which it was thrown. 20. How many seconds is the ball in the air, from throw to catch? 21. What is the minimum speed of this ball while in flight?

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