Question

A 100gm bullet is fired into a 12 kg block which is suspended by a long cord, such that it can swing like a pendulum. If the bullet is embedded in the block and the block rises by 5cm, what was the speed of the bullet?

Answer 1

https://sites.google.com/a/parishepiscopal.org/gende/exam-review/momentum-2 

Answer 2

The ans is 1198cm
We will need to use the equation v^2-u^2=2as
And the momentum equilibrium equation

So , v = 12*9.81*5/12.1
=1198cm