Posted by **amanda and leah** on Monday, January 16, 2012 at 11:58am.

A(n) 7 g bullet is fired into a 122 g block that is initially at rest at the edge of a frictionless table of height 0.9 m. The bullet remains in the block, and after impact the block lands 1.7 m from the bottom of the table.The acceleration of gravity is 9.8 m/s2. Find the initial speed of the bullet. Answer in m/s

- Physics -
**drwls**, Monday, January 16, 2012 at 12:12pm
Use g and the height of the table (H) to get the time that it takes the block and bullet to fall.

t = sqrt(2H/g)= 0.429 s

Then divide 1.7 m by that time to get the (horizontal) velocity of the block/bullet right after impact. Call it v. That horizontal velocity component remains constant as it falls.

Once you have the velocity after impact, use conservation of momentum to get the bullet velocity, V.

m V = (m + M)*v

V = (m + M)*v/m

## Answer this Question

## Related Questions

- physics - An m1 = 8.40 g bullet is fired into a m2 = 2.17 kg block that is ...
- physics - An 8.00 g bullet is fired into a 250 g block that is initially at rest...
- physics - An 8.00 g bullet is fired into a 160 g block that is initially at rest...
- physics - An 8.00 g bullet is fired into a 160 g block that is initially at rest...
- physics - An 8.00 g bullet is fired into a 160 g block that is initially at rest...
- physics - An 8.00 g bullet is fired into a 180 g block that is initially at rest...
- physics - An 8.64g bullet is fired into a 365g block that is initially at rest ...
- Physics - An 8.00 g bullet is fired into a 250 g block that is initially at rest...
- college physics - An 7.81g bullet is fired into a 220g block that is initially ...
- physics - Can someone please help me solve this: An 7.74g bullet is fired into ...

More Related Questions