Hi guys, I was flicking through some past paper IB questions to prepare for the upcoming exam and I came across this: 1. The problem statement, all variables and given/known data (diagram: a large metal bar poised to drop above a smaller bar which is on the ground, and the resulting drop would drive the smaller bar into the ground. ) In the situation shown, the object has a mass 20103.×kg and the metal bar has a has a mass of 400 kg. The object strikes the bar at a speed of 6ms−. It comes to rest on the bar without bouncing. As a result of the collision, the bar is driven into the ground to a depth of 0.75 meters. 2. Relevant questions (a) Determine the speed of the bar immediately after the object strikes it. (b) Determine the average frictional force exerted by the ground on the bar. 3. The attempt at a solution Unsure of which concepts to use in this case. I tried to solve it with potential energy/kinetic energy as well as conservation of momentum.