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54. A 1 kg mass falls from a height of 10 m into a sand box. What is the speed of the mass just before hittingsand box? If it travels a distance of 2 cm into the sand before coming to rest, what is the average retarding for(1) 12 m/sec and 3600 N(3) 16 m/sec and 6400 N(2) 14 m/sec and 4900 N(4) 18 m/sec and 8100 Ntirnlhu with kinetic enery of 490 J. lif the acceleration due to g

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