1. The problem statement, all variables and given/known data Low-frequency vertical oscillations are one possible cause of motion sickness, with 0.60hz having the strongest effect. Your boat is bobbing in place at just the right frequency to cause you the maximum discomfort. Part A - How much time elapses between two waves hitting the ship? Part B- If the wave crests appear to be about 30m apart, what would you estimate to be the speed of the waves? frequency = .60 hz 2. Relevant equations Other than v=lambda * frequency I don't know what formulas to use. 3. The attempt at a solution I have no idea how to solve part-A. Even though I didn't think it would work I tried doing... 2 cycles * 1sec/.6 cycles = 3.3 seconds I also tried... 1/.6z = 1.67sec 1.67 * 2 = 3.3 sec Which gave me the same answer, but that isn't the correct solution according to MasteringPhysics.. I was able to do part B, which has the solution of 18 m/s. Any help, even just the first step is appreciated.