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Q1. A flight attendant pulls her 68.0 N flight bag a distance of 315 m along a level airport floor at a constant speed. The force she exerts is 40.0 N at an angle of 60.0° above the horizontal.

Q2. A 1600 kg submarine rises straight up towards the surface. Seawater exerts both an upward buoyant force of 16430 N on the sub, with a downward resistive force of 1000 N. What is the submarine's acceleration?

Q3. The drawing shows a person (weight W = 579 N, L1 = 0.838 m, L2 = 0.409 m) doing push-ups. Find out the normal force exerted by the floor on each hand and each foot, assuming that person holds this position.

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