11. A moderate wind accelerates a pebble over a horizontal xy plane with a constant acceleration â = (5.00 m/s²)î + (5.00 m/s²)j. At time t 0, the velocity (4.00m/s)i. What are the (a) magnitude and (b) anggle of its velocity when it has been displaced by 12.0 m parallel to the r axis?
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