a = sqrt(750^2+850^2) = 1134 m/s^2.
F = m*a = 0.39 * 1134 = 442.1 N.
At an instant when a soccer ball is in contact with the foot of the player kicking it, the horizontal or x component of the ball's acceleration is 750 m/s2 and the vertical or y component of its acceleration is 850 m/s2. The ball's mass is 0.39 kg. What is the magnitude of the net force acting on the soccer ball at this instant?
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