tethered by a 1 m length of (massless) string, then the string length is halved, what is the change in the velocity of the mass ( if any).
Procedure would be welcomed.
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its conservation of angular momentum
L = rmV
10 x 1 x 10 = 10 x .5 x v
v = (10 x 1 x 10 ) / (10 . .5) = 20
the new velocity is 20m/s