20. A tennis ball's initial velocity is 30 m/s [S]. When struck by a tennis racquet, its velocity becomes 28 m/s [N30°W]. Determine the ball's change in velocity.
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- Initial velocity, \( \mathbf{v_i} = 30 \, \text{m/s [S]} \). - Final velocity, \( \mathbf{v_f} = 28 \, \text{m/s [N30°W]} \). Show more…
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