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softball1394
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Homework Statement
A 7g bullet moving horizontally at 200 m/s strikes and passes through a 150 g tin can sitting on a post. Just after impact, the can has a horizontal speed of 180 cm/s. What the bullet's speed after leaving the can? ANSWER = 161 m/s
Homework Equations
7g = .007 kg
150 g = .15 kg
180 cm/s = 1.8 m/s
The Attempt at a Solution
momentum = m1 x v1 + m2 x v2
=.007kg (200 m/s) + .15kg (0)
=1.4 kg m/s
conversation of momentum--
1.4 kg m/s = 1.4 kg m/s
1.4 = (m1+m2) v
1.4 = (.007 + .15) v
v= 8.92
obviously very wrong :P