A stone of mass m tied to the end of a string revolves in a vertical circle of radius R. The net forces at the lowest and highest points of the circle directed vertically downwards are:
and 
denote the tension and speed at the lowest point. 
and 
denote corresponding values at the highest point:
Lowest Point Highest Point
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
: At the lowest point, mg acts downwards and 
upwards so that net force 
At the highest point, both mg and 
act downwards so that net force 
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