please help with detailed explanation. Differentiating question a and b by stati

Question

please help with detailed explanation. Differentiating question a and b by stating a) and b). this is for me to know which answer is for a and which for b. Thank you

2) A 2-kg mass attached to the end of a string swings in a vertical circle (radius - 6.0 m). When the mass is at the lowest point on the circle, the speed of the mass is 8 m/s. A) What is the magnitude of the force of the string on the mass at this position? B) what is the speed of mass at the top if its tension reduces to 80% of its tension at the bottom? [15 pts]

Explanation / Answer

a)

Force in string on the mass at this position is

F=mv2/r -mg =2*82/6 -2*9.81

F=1.7133 N

b)

NoW Fnew=0.8F =1.37 N

=>1.37 =2*V2/6 -2*9.81

V=7.935 m/s

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