Posted by **Lony** on Monday, July 19, 2010 at 5:45am.

A 15-g bullet is fired horizontally into a 3.000-kg block of wood suspended by a long cord. The bullet sticks in the block. Compute the speed of the bullet if the impact causes the block to swing 10 cm above its initial level.

Initial Velocity of bullet=19.1m/s

- Physics -
**drwls**, Monday, July 19, 2010 at 12:02pm
Use the distance of upward swing to compute the velocity right after impact.

M (9.8 m/s^2)(0.1 m) = (1/2) M V^2

V = sqrt(2 g H) = 1.4 m/s

Now use conservation of momentum, applied to the bullet impact, for the bullet velocity, Vb.

m Vb = (M + m)*1.4 m/s

Vb = 1.4*(3.015/.015) = 281 m/s

That des not agree with what you wrote.

## Answer this Question

## Related Questions

- pHysics !! - A 20-g bullet is fired horizontally into a 980 g block of wood ...
- Physics - A bullet with a mass of 0.01kg is fired horizontally into a block of ...
- Physics - If a 5.40g bullet is fired horizontally into a suspended(hanging)10kg...
- Physics - If a 5.40g bullet is fired horizontally into a suspended(hanging)10kg ...
- physics - A 10-g bullet of unknown speed is shot horizontally into a 2-kg block ...
- PHYSICS HELP!!!!! - A 7.0 g bullet is fired horizontally into a 1.5 kg block of ...
- Mechanical engineering - A bullet of mass 50 grams is fired horizontally into a ...
- Physics HELP! - A 20.0 g bullet is fired horizontally into a 85 g wooden block ...
- physics - a 100-g bullet is fired horizontally into a 14.9kg block of wood ...
- physics - A heavy wooden block rests on a flat table and a high-speed bullet is...

More Related Questions