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Q. An air mattress is 2.2 long, 0.50 wide, and 15 deep.If the air mattress itself has a mass of 0.25 , what is the maximum mass it can support in freshwater?

Q. A projectile is launched from ground level with an initial speed of 53.7 m/s. Find the launch angle (the angle the initial velocity vector is above the horizontal) such that the maximum height of the projectile is equal to its horizontal range. (Ignore any effects due to air resistance.)

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