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2. Two cars race against each other. Both cars are initially side-by-side and at rest. The cars then accelerate uniformly at different rates. Car A accelerates at 1.3 ms-2 and car B accelerates at 2.5 ms-2. After 10 s, how far apart will the cars be (in m)? (A) O (B) 20 (C) 40 (D) 60 (E) 100 3. A polar explorer drags a sled across a horizontal, smooth ice surface. She and the sled are accelerating at a rate of 0.300 ms-2. The explorer (and her clothes) weigh 85.0 kg, the sled weighs 400 kg, and the ice exerts a frictional force of 80 N on the sled. What is the magnitude of the horizontal force that the explorer is exerting on the ice (in N)? (A) 226 (B) 312 (C) 453 (D) 501 (E) 612 4. A 50 kg box is sitting on the floor of a lift. In the diagram below, the lift is stationary box dos W 10 YT lift floor F The magnitude of the weight force on the box is labelled W and the magnitude of the normal force from the floor on the box is labelled F. The lift is initially stationary. It then accelerates upwards briefly and then decelerates and stops. Which ONE of the following statements is TRUE? (A) When the lift accelerates upwards, W < 500 N. (B) When the lift decelerates, W > 500 N. (C) Newton's first law states that W = F at all times. f (D) When the lift accelerates upwards, F > 500 N. (E) Newton's third law states that W = F at all times.)