A0.150 kg ball on the end of a 1.10 m long cord (negligible mass)is swung in a vertical circle..
(a) what is the minimum speed the ball must have at the top of its arc so that the ball continues moving in a circle?
calculate the tension in the cord at the bottom of the arc assuming the ball is moving at twice the speed of part (a)

Explanation:

At the top position of the arc if ball continue in its circular path then we can say that tension force must be zero at that position for the minimum value of the speed.

So we will have

so if minimum speed is required to complete the circle T = 0

so we will have

again we will have

an obstruction

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