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UPEF A1 Movie 1: Motion of two carts affected by slightly compressed spring
UPEF A1 Movie 2: Motion of two carts affected by spring compressed different amounts
UPEF A1 Movie 3: Carts of different masses affected by compressed spring
UPEF A1 Movie 1: Motion of two carts affected by slightly compressed spring
UPEF A1 Movie 1: Motion of two carts affected by slightly compressed spring