# Force / Work

1. Mar 9, 2005

An arrow of mass 20 grams is shot horizontally into a bale of hay with a velocity of 60 m/s. It penetrates a debpt of 20 CM before stopping.

What is the average stopping force acting on the arrow?

I've been doing

W = -F*D
W = -(ma)*d

I'm finding a by using a kinematic equation, v (final ) ^2 = v (initial ) ^ 2 + 2 a (delta) x.

The answer I'm getting is 360 N, but that is not the correct answer. Any ideas?

Last edited: Mar 9, 2005
2. Mar 9, 2005