Bullet fired into wooden block. Trying to find kinetic energy of bullet and block.

  • Thread starter DPatel304
  • Start date
  • #1
2
0
Stuck on this one problem which states:
A bullet with a mass of 6.00 g, traveling horizontally with a speed of 370 m/s, is fired into a wooden block with mass of 0.750 kg, initially at rest on a level surface. The bullet passes through the block and emerges with its speed reduced to 120 m/s. The block slides a distance of 49.0 cm along the surface from its initial position.
Use g = 9.81 m/s^2 for the acceleration due to gravity.


And I am trying to find this:
What is the kinetic energy of the block at the instant after the bullet passes through it?

If more information is needed, I can post it. Thanks in advance for your help.

Btw, the first portion of the question asked for the coefficient of friction, which I was able to get:
What is the coefficient of kinetic friction between block and surface?
0.416

and this:
What is the decrease in kinetic energy of the bullet?
368 J
 

Answers and Replies

  • #2
Hootenanny
Staff Emeritus
Science Advisor
Gold Member
9,621
6


Can you find an expression for conservation of energy of the system?

Of course we are ignoring any deformation of the block or bullet.
 

Related Threads on Bullet fired into wooden block. Trying to find kinetic energy of bullet and block.

  • Last Post
Replies
2
Views
3K
  • Last Post
Replies
2
Views
10K
  • Last Post
Replies
12
Views
4K
Replies
3
Views
3K
Replies
7
Views
7K
Replies
5
Views
751
Replies
6
Views
9K
Replies
3
Views
2K
  • Last Post
Replies
3
Views
6K
Top