Tuesday

October 21, 2014

October 21, 2014

Posted by **Hester** on Monday, December 5, 2011 at 4:22pm.

1) If the maximum height of the block is ,h, is 35 cm, how fast was the bullet originally moving?

(can you explain the steps i'm really confused)

- AP Physics -
**Colin**, Sunday, April 7, 2013 at 3:26pmm1= mass of the bullet

m2= mass of the block

Vf=sqrt(2gh)

v1= initial velocity of bullet

v2= initial velocity of the block = 0

so

first is conservation of momentum

m1v1+m2v2=(m1+v2)Vf

solve for v1 (note m2v2=0)

v1=((m1+m2)/m2)/Vf

to find Vf look at conservation of energy

KE+PE=KE'+PE'

.5(m1+m2)Vf^2+0=0+(m1+m2)gh

Solve for Vf and you get Vf=Sqrt(2gh)

now v1=((m1+m2)/m2)/(sqrt(2gh)) and solve

v1= 15.715 m/s

**Answer this Question**

**Related Questions**

PHYSICS HELP MEEE SO CONFUSED - Liam fires a bullet into a block suspended by ...

Physics - A 2.50g bullet, traveling at a speed of 425m/s, strikes the wooden ...

physics - A heavy wooden block rests on a flat table and a high-speed bullet is...

physics - A heavy wooden block rests on a flat table and a high-speed bullet is ...

Mechanical engineering - A bullet of mass 50 grams is fired horizontally into a ...

physics - The ballistic pendulum is a device used to measure the speed of a fast...

physics - a bullet of mass of 12 grams is fired into a large block of mass 1.5 ...

pHysics !! - A 20-g bullet is fired horizontally into a 980 g block of wood ...

physics - A 12.0 g bullet is fired into a 13.9kg wooden block that is hanging ...

Physics - A block of mass m 1 sits at rest on a table over a hole in the table. ...