Kinematics Question 491

Question: A stone tied to a string of length L it’s whirled in a vertical circle with the other end of the string at the centre. At a certain instant of time, the stone is at it’s lowest position and has a speed u . The magnitude of the change in it’s velocity as it reaches a position where the string is horizontal it’s[IIT 1998; CBSE PMT 2004]

Options:

A) u22gL

B) 2gL

C) u2gl

D) 2(u2gL)

Show Answer

Answer:

Correct Answer: D

Solution:

12mu212mv2=mgL

therefore v=u22gL

|vu|=u2+v2=u2+u22gL=2(u2gL)



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