A stone of mass m tied to the end of a string revolves in a vertical circle of radius R. The net force at the lowest and highest points of the circle directed vertically downwards are: [ Choose the correct alternative] Lowest Point"" Highest point (a) mg +T_(1)""mg + T_(2) (b) mg +T_(1)""mg - T_(2) (c ) mg + T_(1)- (mv_(1)^(2))//R""mg - T_(2) + (mv_(1)^(2))//R (d) mg -T_(1) -(mv_(1)^(2))//R"" mg + T_(2) + (mv_(1)^(2))//R T_(1) and v_(1) denote the tension and speed at the lowest point. T_(2) and v_(2) denote corresponding values at the highest point.

A stone of mass m tied to the end of a string revolves in a vertical c

1.	A stone of mass m tied to the end of a string revolves in a vertical circle of radius R. The net force at the lowest and highest points of the circle directed vertically downwards are: [ Choose the correct alternative] Lowest Point"" Highest point (a) mg +T_(1)""mg + T_(2) (b) mg +T_(1)""mg - T_(2) (c ) mg + T_(1)- (mv_(1)^(2))//R""mg - T_(2) + (mv_(1)^(2))//R (d) mg -T_(1) -(mv_(1)^(2))//R"" mg + T_(2) + (mv_(1)^(2))//R T_(1) and v_(1) denote the tension and speed at the lowest point. T_(2) and v_(2) denote corresponding values at the highest point.
Answer» SOLUTION :Alternative (a) is correct. Note: MG + `T_(2) = mv_(2)^(2)`/R, `T_(1) - mg = mv_(1)^(2)`/R in this EXAMPLE