Wednesday
November 26, 2014

Homework Help: Physics

Posted by CJ on Friday, March 2, 2007 at 2:53am.

A 2.50g bullet, traveling at a speed of 425m/s, strikes the wooden block of a ballistic pendulum. The block has a mass of 270g
(a) find the speed of the bullet/block combination immediately after the collision
(b) how high does the combination rise above its initial position?

(a) (bullet mass) x (bullet initial velocity) = (total mass) x (speed of bullet & block)
Solve for (speed of bullet & block)

(b) since kinetic energy of bullet & block = increase in potential energy at top of swing
g h = (1/2) (speed of bullet & block)^2

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