JEE Main 2021 — Circular Motion Question with Solution
From: JEE Main 2021 (Online) 25th February Morning Shift
Question
A small bob tied at one end of a thin string of length 1 m is describing a vertical circle so that the maximum and minimum tension in the string are in the ratio 5 : 1. The velocity of the bob at the highest position is ________ m/s. (Take g = 10 m/s2)
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Show full solutionCorrect answer: 5
Correct answer
5
Step-by-step explanation
Let the speed of bob at lowest position be v1 and at the highest position be v2.
Maximum tension is at lowest position and minimum tension is at the highest position. Now, using, conservation of mechanical energy,
..........(1)
Now,
&
m/s
Thus, velocity of bob at highest position 5 m/s.
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