Question

A 10 g bullet is fired horizontally into a 1 kg block of wood hanging from a 1 m long string attached to the ceiling, getting stuck in the block. Due to the impact, the block then swings on the string to a maximum angle of 60 degrees with respect to the vertical. How fast was the bullet traveling in m/s?

Details and assumptions
The acceleration of gravity is −9.8 m/ss.
You may neglect air resistance.

Answer 1

http://hyperphysics.phy-astr.gsu.edu/%E2%80%8Chbase/balpen.html

Answer 2

i could not get there hw to put angle

Answer 3

That's easy. From the given conditions, height= length/2