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A 2.76-kg steel ball strikes a massive wall at 10.0 m/s at an angle of ? = 60.0° with the plane of the wall. It bounces off the wall with the same speed and angle (see the figure below). If the ball is in contact with the wall for 0.198 s, what is the average force exerted by the wall on the ball? (Take to the right as the +x-direction and up as the +y-direction.)

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