Posted by Sarah on Monday, February 8, 2010 at 8:08pm.
A 0.0160kg bullet traveling horizontally at 396 m/s strikes a 3.95kg block of wood sitting at the edge of a table. The bullet is lodged into the wood. If the table height is 1.06 m, how far from the table does the block hit the floor?

physics  Sarah, Monday, February 8, 2010 at 8:26pm
I had thought that to do this, you'd add the momentum of the two and set it equal the combined mass to find the velocity.
.0160(396)+3.95(0)=3.966(V)
V=1.59m/s
Then I set up a triangle to try to find the distance from the table and used V as the c value in the pythagorean theorem.
1.06^2+x^2=1.59^2
x=1.19m
But the book says that isn't correct. What am I doing wrong?

physics  fairy god mother, Thursday, November 19, 2015 at 6:40am
yes, you mixed up your units. you divided the sqrt of a velocity and a height expecting to get a height.
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