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How far from the starting point do the pieces fall on ground?

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An object is thrown with speed 20 m/Sunder the angle pi/3 rad with the horizontal direction. In the highest point, the object is divided into two pieces with same weights. One of them, after the division has the speed 0.
How far from the starting point do the pieces fall on ground?

The piece that has the speed 0:
x1=v0^2sin2a/2g=17.32 m
x2=v0^2sin2a/g=34.64 m
The answer in the book is 10, 20 meters.

Closed as per community consensus as the post is not graduate-level

asked Nov 1, 2016 in Closed Questions by annalia10 (-35 points) [ no revision ]
closed Nov 2, 2016 as per community consensus

This is not graduate-level, voting to close.

commented Nov 1, 2016 by Dilaton (6,240 points) [ no revision ]

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