A body is released from rest and allowed to fall freely from a given height under gravity. The kinetic energy at its half-way point is?
A weight of 1000 grams hangs from a lever 20cm to the fulcrum. At the left is a 500-gram weight 20cm from the fulcrum, and a 200-gram weight x cm away from the fulcrum. What is the value of x that will make the lever balanced?