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Matrix question: Determine the value(s) of x such that? Could turtles run fast if they really wanted to? What is the de Broglie wavelength for a (relativistic) electron having a kinetic energy of 3.40 MeV? A barrel of 50kg is loaded into a lorry 1.6m high through a plank of length 3.4m. What is the minimum workdone.? Please I need answers on thermal physics and relativity?