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Pick a cart, put it on a track and slam it into a second cart. Change the mass and/or the velocity and repeat the experiment. Put two carts next to each other on the same track with a firecracker between them, Ignite the fuse and watch the carts fly apart when the firecracker explodes. Do all this and more without getting yelled at by your physics teacher or sent to the deans office for possession of incendiary devices. What a blast!