Posted by **Student** on Thursday, April 8, 2010 at 10:48am.

A ball of mass m at rest at the coordinate origin exploded into three equal pieces. At a certain instant, one piece is on the x-axis at x=40cm, and another is at x=20cm, y= -60 cm. Where is the third piece at that instant.

- PHYSICS -
**bobpursley**, Thursday, April 8, 2010 at 11:12am
The initial momentum is zero, so the final vector momentum is zero. You have the positions, dividing by time t means velocity.

in the x:

0=1/3 40/t + 1/3 20/t + 1/3 x/t

multipy both sides by t, solve for x.

in the y:

0=1/3 0 + 1/3 (-60/t) + 1/3 y/t

solve for y.

you have x,y coordinate of the third piece at that time t.

- PHYSICS -
**Student**, Thursday, April 8, 2010 at 11:21am
IS the answer going to be

(-60,60)

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