# Spring and Oscillation

1. Dec 14, 2006

### parwana

A 5.00 g bullet moving with an initial speed of v0 = 405 m/s is fired into and passes through a 1.00 kg block, as in Figure P13.58. The block, initially at rest on a frictionless horizontal surface, is connected to a spring with a spring constant of 950 N/m.

Figure P13.58
(a) If the block moves 5.00 cm to the right after impact, find the speed at which the bullet emerges from the block.
m/s
(b) If the block moves 5.00 cm to the right after impact, find the mechanical energy lost in the collision. J

I dont know where to begin, its so frustrating

2. Dec 14, 2006

Not that I wouldn't like to help you, but I'm almost 100% positive I've seen this exact picture in the last 2 or 3 weeks. I suggest you do some searching first.

3. Dec 14, 2006

### parwana

I checked the thread and it wasnt much of a help

I tried to use conservation of momentum for this but it doesnt work

4. Dec 14, 2006

### drpizza

Try conservation of energy.

5. Dec 14, 2006

### parwana

how do I set it up though

.5kx^2= .5mv^2?

6. Dec 14, 2006

### Kurdt

Staff Emeritus
The original kinetic energy will be the sum of the spring energy and the bullets remaining kinetic energy after impact.