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Google the refractive index of sodium chloride. Let the value be n. Then solve with the simple n = sin i/sin r The given frequency of speed of light in air is not useful.
a)Let final speed of A be v1, and final speed of B be v2.Using conservation of momentum, consider the horizontal: 40m = v1*cos30 + v2*cos45 and the vertical 0 = v1*sin30 + v2*sin45 In second equation, express v1 in terms of v2, then substitute into the
