Walter gets a paper back in lab with “-2.75% error” written on it. He had found the mass of an object to be 100.7 grams. What should he have found as the mass of the object?

Two metal blocks that have slightly different temperatures are placed next to one another. after five minutes, they both have lower but equal temperatures. according to the law of conservation of energy, what  most likelyhappened? energy was created inside the blocks. energy was destroyed inside the blocks. energy was absorbed into the blocks from outside the system. energy was transferred from the warmer block to the cooler block.