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How can I calculate the final velocity when the the initial velocity is unknown and all I have is the mass, acceleration, and speed? A 1.00 kg mass oscillates according to the equation x=0.550cos8.20t, where x is in meters and t is in seconds.determine the frequency.? Check that the differential equation (2xy+y^3)dx+(x^2+3y^2x)dy=0 is exact. Find the general solution. Then find the solution satisfy y(1)=2? Shouldn't the speed of light actualy be 6x10 ^8 since we can only measure 3x10^8 as the average speed of light in space? Doesn't time change at different parts of the Univese?