How the cross sectional area of the aorta in atherosclerosis changes if the velocity of blood flow increases 3 times?

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Avery hard rubber ball (m = 0.5 kg) is falling vertically at 4 m/s just before it bounces on the floor. the ball rebounds back at essentially the same speed. if the collision with the floor lasts 0.05 s, what is the average force exerted by the floor on the ball?

Astate of matter all that has define volume and can flow is a(n)