Physics
posted by Rob .
A bullet of mass m=0.060 kg hits a 5.0 kg block with an initial speed of 225 m/s. The block is connected to a spring that is attached to a wall. The friction between the block and the table is negligible. Upon impact, the bullet bounces back from the box with a speed of 75 m/s.
A) Calculate the speed of the block right after the collision.
B) As a result of the collision, the spring compresses to a mazimum of 0.20m. Find the spring constant
The equation to this is 1/2mv^2 = 1/2kx^2 right? I can't get the answer to this question without the answer to part A.
C) Find the inelastic energy loss during the collision.

a. Momentum conserved. m*225=(5+.06)V
solve for V 
I got 2.67 m/s from your equation. But the correct answer is supposed to be 3.6 m/s.

Also, for part C, do I do KE final minus KE initial?
So 1/2(5.06)(75^2)  1/2(0.06)(225^2) ? 
the correct equation is this: (.06)(225) = (5)(v)  (.06)(75)
momentum is conserved. total momentum is equal to the momentum of the block minus the momentum of the bullet. you subtract because the two objects move in opposite directions.
Respond to this Question
Similar Questions

physics
A heavy wooden block rests on a flat table and a highspeed bullet is fired horizontally into the block, the bullet stopping in it. How far will the block slide before coming to a stop? 
physics
A heavy wooden block rests on a flat table and a highspeed bullet is fired horizontally into the block, the bullet stopping in it. How far will the block slide before coming to a stop? 
physics
A 20 g bullet moving horizontally with a speed v hits a 2kg block of wood resting on a table. After hitting the block the bullet is embedded in the block of wood and the block and the bullet moves a distance of 40 cm before it stops. … 
Physics HELP!
A 20.0 g bullet is fired horizontally into a 85 g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring having spring constant 156 N/m. The bullet becomes embedded in the block. The bullet … 
Physics Elena please help!
A 20.0 g bullet is fired horizontally into a 85 g wooden block that is initially at rest on a frictionless horizontal surface and connected to a spring having spring constant 156 N/m. The bullet becomes embedded in the block. The bullet … 
PhysicsPlease Help!!
A bullet of mass m=0.060 kg hits a 5.0 kg block with an initial speed of 225 m/s. The block is connected to a spring that is attached to a wall. The friction between the block and the table is negligible. Upon impact, the bullet bounces … 
Physics... Help!
A bullet of mass m=0.060 kg hits a 5.0 kg block with an initial speed of 225 m/s. The block is connected to a spring that is attached to a wall. The friction between the block and the table is negligible. Upon impact, the bullet bounces … 
Physics
A heavy wooden block rests on a flat table and a highspeed bullet is fired horizontally into the block, the bullet stopping in it. How far will the block slide before coming to a stop? 
Physics
You have been asked to design a "ballistic spring system" to measure the speed of bullets. A bullet of mass m is fired into a block of mass M. The block, with the embedded bullet, then slides across a frictionless table and collides … 
Physics
A 15.0 gram bullet with a speed of v is fired into a 400 gram block of wood that is initially at rest on a surface. The coefficient of kinetic friction between the block and the surface is 0.250. The block of wood is attached to a …