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A pumpkin of mass 5kg shot out of a student-made cannon under air pressure at an...

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Physics

A pumpkin of mass 5kg shot out of a student-made cannon underair pressure at an elevation of 45 degrees fell at a distance 142mfrom the cannon. The students used light beams and photocells tomeasure the initial velocity of 54m/s. If the resistive force was F= -kmv^2, what was the value of k?

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