Two blocks with masses m1 = 0.20 kg and m2 = 0.60 kg start at opposite ends of a frictionless U-shaped track, although not necessarily at the same height as one another. After being released from rest, they slide down the track and then collide with one another where the track is level. After the collision, both blocks are at rest. Block 1 descends a total height h1 = 36 cm.  The collision between blocks takes 0.06 s. Find the magnitude of the average force of block 2 on Block1  Is energy conserved during the collision? Support your answer with a conceptual argument or a calculation.  Find the value of h2, the height that block 2 descended.

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