This is actually a lab-
A ball projectile is fired from a spring gun into a free-hanging pendulum, the pendulum catches the ball and travels a certain vertical measurement.
#1-Is this an elastic equation
#2-Calculate the kinetic energy the instant before and the instant after the collision.
The Attempt at a Solution
#1- I think that this is an elastic equation because no energy is lost in the collision- it is transferred from the spring gun to the pendulum (discounting air resistance).
#2- I calculated the kinetic energy using the above equation to be 1.43 J- I am thinking that this is the kinetic energy before the collision and it is -1.43 after?
If I'm wrong I would really appreciate being pointed in the right direction.