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An object of mass m is constrained to move on a horizontal frictionless circular track of radius
m starts fIrom rest at time t = 0 and thereafter is puushed by an external force with constant
magnitude F, always horizontal and tangent to the track. The horizontal component of the
force exerted by the track on the object is given by
А. О
В. F
C. Ft/mR
D. Ft2/mR
E. F/mg
ans: D

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