Question 13: A block of mass M is released at rest and it is under going acircular motion in a path of radius R as shown in Figure 7. The gravitationalforce acts on the block. Assuming that a friction force of magnitude f = b02/3also acts on the block where b is a constant and 0 is the angle with the horizontalas shown in Figure 7 (g is the gravitational acceleration), find the speed of theblock when the block is at 0 = 1/6 angular position (sin(7/6) = 1/2 andcos(7/6) = v3/2).mRFigure 7Select one:56R,A- )5/36m 6gR106R, TgR)3/26.9m96RgR)2/310m5bR,T3/5gR6m 66bR ,gR5m 5/3

given that mass of block = M radius of path = R friction force f=bθ2/3

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