Too many labs say delta PE = delta KE. This is not true. Everyone should be aware that IF Win adn Qin adn delta Eth all =0, then delta PE equals the OPPOSITE of delta KE, i.e PE gains what KE loses and vis versa.
In this particular lab all the KE right after the collision becomes PE when the motion stops. Thus for the period beginning when the collision ends, and ending when the pedulum reaches maximum height, delta KE = O- KE' = -KE' so delta PE = --KE' or KE' = delta PE, but only in situations like this and note again that KE' is the intial KE befoer the PE starts to increase.
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