1. The problem statement, all variables and given/known data Adjacent antinodes of a standing wave on a string are 15.0cm apart. A particle at an antinode oscillates in simple harmonic motion with amplitude 0.850cm and period 0.0750s. The string lies along the +x-axis and is fixed at x = 0. the speed of the two travelling waves are 4.00m/s Find the maximum and minimum transverse speeds of a point at an antinode. 2. Relevant equations v=Aωcos(ωt) 3. The attempt at a solution I was just reading this post: https://www.physicsforums.com/threa...erse-speeds-of-a-point-at-an-antinode.218615/ and I couldn't understand why they've taken cos(wt)=1 and cos(wt)=0 as the bounds. If it's an antinode, wouldn't it be max at 1 and min at -1? Secondly, their final answers were v max=0.712, vmin=4.36 x 10^-17 but if cos(pi/2)=0 then v=min will be 0, how did they get 4.36 x 10^-17?