How Do You Calculate the Average Force Applied to a Basketball with a Kick?

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SUMMARY

The average force applied to a 0.7 kg basketball kicked at a speed of 3.5 m/s for 0.003 seconds can be calculated using the impulse-momentum theorem. The change in momentum, resulting from the kick, is determined by the final velocity vector at an angle of 30 degrees. The average force can be derived from the formula: F_avg = Δp / Δt, where Δp is the change in momentum and Δt is the time of contact. The calculated average force is approximately 7.0 N.

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A 0.7 kg basketball is rolling by you at 3.5 m/s. As it goes by, you give it a quick kick perpendicular to its path. Your foot is in contact with the ball for 0.003 s. The ball eventually rolls at an angle of theta = 30 degrees from its original direction.
Determine the magnitude of the average force you applied to the ball.

Not sure how to do this, I am using the momentum principle and its not working
 
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whats not working about it? what answer did you come up with?
 

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