I forget how to solve one dimensional motion problems with friction, which is holding me up in this problem:(adsbygoogle = window.adsbygoogle || []).push({});

a 5.00 g bullet is fired horizontally into a 1.2 kg wooden block resting on a horizontal surface. The coefficient of kinetic friction between the block and surface is .2. The bullet remains embedded in the block and the block moves 0.23 m before stopping. What is the initial speed of the bullet?

bullet------->block----.230 M-[ ]

looking at it as a momentum problem:

M(bullet)*V(bullet) = M(Bullet+Block)*V(bullet+block)

you need to solve for v(bullet+block) which can be determined by the following problem:

A block of mass 1.25 kg on a surface with kinetic friction of .2 is acted on upon a force and move .230 M before coming to rest on a horizontal surface. Find the initial speed of the bullet.

m = 1.25

v_0 = x

v_x = 0

mu_k = .2

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Inelastic Collision with Friction

**Physics Forums | Science Articles, Homework Help, Discussion**