Posted by **Alex** on Wednesday, March 28, 2012 at 8:05am.

An indestructible bullet 1.85 cm long is fired straight through a board that is 11.5 cm thick. The bullet strikes the board with a speed of 400 m/s and emerges with a speed of 285 m/s.

(a) What is the average acceleration of the bullet as it passes through the board?

Give your answer in in scientific notation rounded to three significant figures.

(b) What is the total time that the bullet is in contact with the board?

Round your answer to the nearest millionth, if necessary. Give your answer in seconds.

**This I have correctly calculated to be 0.000390seconds***

(c) What thickness of board (calculated to 0.1 cm) would it take to stop the bullet, assuming the bullet's acceleration through all boards is the same?

Give your answer in centimetres.

- Physics -
**Elena**, Wednesday, March 28, 2012 at 10:45am
a=(V^2-Vo^2)/2•s

s=11.5+1.85=13.35 cm=0.1335 m

a =2.95•10^5 m/s

t=(V-Vo)/a =0.000390 s

s1 = V^2/2•a = 0.542 m=54.2 cm

- Physics -
**Anonymous**, Saturday, July 9, 2016 at 9:52am
ppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppp

## Answer This Question

## Related Questions

- Physics - A 25 g bullet with a muzzle velocity of 300 m/s is fired into a board...
- Physics - A 25 g bullet with a muzzle velocity of 300 m/s is fired into a board ...
- Physics - A 25 g bullet with a muzzle velocity of 300 m/s is fired into a board ...
- Physics - A bullet is fired through a board 12.1 cm thick, with a line of motion...
- Physics - while at the shooting range, jonathan shoots a bullet traveling ...
- physics - A bullet is fired through a wooden board with a thickness of 10.0 cm. ...
- Physics - A bullet is fired through a wooden board with a thickness of 12.0 cm. ...
- physics - A bullet is fired through a wooden board with a thickness of 8.0 cm. ...
- physics - a bullet travelling horizontally at a speed of 350 m/s hits a board ...
- physics - A bullet traveling horizontally at a speed of 350 hits a board ...

More Related Questions