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A ball tied to a string of length R is given a speed V, when its hanging vertically. At some point B during its circular motion, the string gets slacked & after that the body passes through its initial point.

A ball tied to a string of length R is given a speed V, when its hanging vertically. At some point B during its circular motion, the string gets slacked & after that the body passes through its initial point.

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Grade:11

2 Answers

Shadow
27 Points
one year ago
In vcm a string slack at 131 °  approx
So 90+x is equal to 131
Now x is equal to 31approx
So option A 30 is correct
 
 
If we use tension formula 
Putting angle 130 degree 
0=mv2/l -2mg+3mgcos130°
We will get velocity 
 
That is option c
 
 
 
 
And at last
If we use
This formula
 
 
Now if we use v sqare equal to u square minus 2gr(1-cos131 )
We will got the answer
Option a
 
 
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