The force needed to maintain a constant velocity of 0.8 m/s on air track is found to be 0.005 N. The area of the cart is 0.05 m2. If the viscosity of air is 1.8 x 10 Pa s, the thickness Ay (in meter) of the air layer equals a) 1.08 x 104 b) 7.2 x 105 c) 1.44 x 104 d) 5.4 x 10s
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