a) the 15 kg sled moves at 0.30 m/s [left] after collision. b) the 15 kg sled rebounds at 0.45 m/s [right] after collision. c) The two sleds sticks together. 13. A rocket car trying to beat the record speed for a vehicle moving on land, has a mass of. 1.4 X 10 4 kg. The car moves forward by expelling gases from its engines at a rate of. 10 kg/s. B. 60 J C. 40 J D. 20 J 13. What is the speed of the block when it reaches the horizontal surface? A. 3.2 m/s B. 4.3 m/s C. 5.8 m/s D. 7.7 m/s 14. A crane lifts a 300 kg load at a constant speed to the top of a building 60 m high in 15 s. The average power expended by the crane to overcome gravity is: A. 10,000 W B. 12,000 W

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