Aspeed time graph shows that a car moves at 20 m/s for 15s. the car's speed steadily decreases until it comes to a stop at 40s. which of the following describes the slope of the speed time graph from 15s to 40s

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.