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A block of 200g mass moves with a uniform speed in a horizontal circular groove, with vertical side wall of radius 20m. If the block takes 40s to complete one round, the normal force by the sidewalls of the grooves=?
A) 6.28x10^(-3)N
B) 0.0314N
C) 9.859x10^(-2)N
D) 9.859x10^(-4)N

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