- #1

Arm

- 16

- 5

- Homework Statement
- A bullet with a mass of 5.0 g is fired horizontally into a 2.0 kg wooden block which is

resting on a horizontal table. The bullet stops in the block and the block and bullet

combination move 2.0 m. The coefficient of kinetic friction between the block and

surface of the table is 0.2. Find the initial speed of the bullet.

- Relevant Equations
- $$ KE = \frac{mv^2}{2} $$

$$ W = \Delta E = F * distance $$

$$ F_friction \le F_N * \mu $$

$$ g = 10 $$

$$ \frac{5E-3*v^2}{2} = (2 + 5E-3)(10)(0.2)(2) $$

v = 56.64

I just don't get how this is the wrong answer....it's just simple conservation of energy, right?

v = 56.64

I just don't get how this is the wrong answer....it's just simple conservation of energy, right?