1.

A mass m connected to inextensible string of length l lie on a horizontal smooth ground. Other end of string is fixed. Mass m is imparted a velocity v such that string remains taut & motion occurs in horizontal providely stirng during the time string turns through 90^(@)

Answer»

2mv
mv
`SQRT(2)mv`
`msqrt(2v^(2)-2gl)`

Solution :Impulse `=Deltavecp=vecP_(f)-vecp_(i)=m DELTAVECV`
`=m(vhatj-vhati)`
|impulse| `=sqrt(2)mv`


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