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August 27, 2014

Homework Help: physics

Posted by billy on Thursday, September 29, 2011 at 7:37pm.

A ball in tennis is lofted with an initial speed of 15m/s, at and angle of 50 degrees above the horizonal. At this instant, the opponent is 10m away from the ball. He begins moving backwards 0.3s later, hoping to reach the ball and hit it back at the moment it is 2.10m above its launch point. With what minimum speed must he move?

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