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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 10
c) 1.44 x 104
d) 5.4 x 10s

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