A machine part is undergoing SHM with a frequency of 3.40 Hz and amplitude 1.80 cm. How long does it take the part to go from x = 0 to x = -1.80 cm?

Asailboat is traveling to the right when a gust of wind causes the boat to accelerate leftward at 2.5m/s2 for 4s. after the wind stops, the sailboat is traveling to the left with a velocity of 3.0m/s.assuming the acceleration from the wind is constant, what was the initial velocity of the sailboat before the gust of wind? answer using a coordinate system where rightward is positive.