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Mechanics question help

U

utsav156

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a stone of mass 0.5 kg is attached to one end of a light inextensible string of length 0.4 m. the other end of the string is attached to a fixed point o.the stone is released from the rest with the string taunt and inclined at an angle of 40 degree below the horizontal through o. calculate the speed of the particle as it passes beneath o.
calculate also the speed of the stone when the string makes an angle of 20 degree with the vertical through o.

please help me with this answer!!!
:)
 
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