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November 22, 2014

Homework Help: physics

Posted by Jen on Friday, April 9, 2010 at 11:02am.

A 0.145 kg block is released from rest from
the top of a 51.7◦ frictionless incline. When
it has fallen a vertical distance of 1.3 m, a
0.00794 kg bullet is fired into the block along
a path parallel to the slope of the incline, and
momentarily brings the block to rest, stopping
in the block.
The acceleration of gravity is 9.8 m/s2 .

a) Find the speed of the bullet just before
impact.

Answer in units of m/s.

b) What bullet speed is needed to send the block
up the incline to its initial position?

Answer in units of m/s.

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