a particle is moving in the vertical plane.It is attached at one end of a string of length l whose other end is fixed.The velocity at the lowest point is u.The tension in the string is T and the acceleration of the particle is a at any position.Then T.a is zero at the hishest point:

Question

a particle is moving in the vertical plane.It is attached at one end of  a string of length l whose other end is fixed.The velocity at the lowest point is u.The tension in the string is T and the acceleration of the particle is a at any position.Then T.a is zero at the hishest point:

samigupta8 · Answer

$$a. u \le \sqrt{2gl}$$$$b.   u \le \sqrt{5gl}$$$$c.u=\sqrt{2gl}$$$$d.u> \sqrt{2gl}$$

anonymous · Answer

i didn't understand the last sentence of the question?! T.a !? what do you mean?

samigupta8 · Answer

i mean to say that tension * acceleration will be zero when which of the conditions wil be satsified?

anonymous · Answer

is this uniform circular motion ?!