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OpenStudy (awesome781):
A bowling ball with a mass of 7.0 kg strikes a pin that has a mass of 2.0 kg. The pin flies forward with a velocity of 6.0 m/s, and the ball continues forward at 4.0 m/s. What was the original velocity of the ball?
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OpenStudy (fifciol):
|dw:1387998363608:dw| momentum must be conserved(any external forces act on the objects) \[m_1v+0=m_1v_1+m_2v_2\]
OpenStudy (awesome781):
So how do I plug the numbers?
OpenStudy (fifciol):
7*v=7*4+6*2
OpenStudy (awesome781):
I got 5.7 m/s as my answer....
OpenStudy (fifciol):
that's correct
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OpenStudy (awesome781):
Ok...thanks again!!!!
OpenStudy (fifciol):
yw
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