Kinematics Question 740

Question: A ball of mass 0.25 kg attached to the end of a string of length 1.96 m is moving in a horizontal circle. The string will break if the tension it’s more than 25 N. What is the maximum speed with which the ball can be moved [CBSE PMT 1998]

Options:

A) 14 m/s

B)3 m/s

C) 3.92 m/s

D)5 m/s

Show Answer

Answer:

Correct Answer: A

Solution:

$ T=\frac{mv^{2}}{r} $

therefore $ 25=\frac{0.25\times v^{2}}{1.96} $

therefore $ v=14m/s $



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