An 8.00 g bullet is fired into a 250 g block that is initially at rest at the edge of a table of 1.00 m height (Fig. P6.30). The bullet remains in the block, and after the impact the block lands d = 1.5 m from the bottom of the table. Determine the initial speed of the bullet.(adsbygoogle = window.adsbygoogle || []).push({});

this is what i did:

time for block to hit floor:

x = ut + 0.5at^2

1.0 = 0.5*9.8t^2

t = 0.4517 seconds

acceleration needed to move block 1.5 meters in t seconds

1.5 = 0.5a*0.4517^2

a = 14.7

velocity at time of hitting the ground:

v=u+at

v=6.63999 m/s

mv = (m+M)V

.008v = (.258)6.63999

v = 214.139m/s

this is the wrong answer; could someone give me a hand?

thanks

bill

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Bullet block problem again

**Physics Forums | Science Articles, Homework Help, Discussion**