Posted by **Sarah** on Monday, February 8, 2010 at 8:08pm.

A 0.0160-kg bullet traveling horizontally at 396 m/s strikes a 3.95-kg 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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