the lowest note on a piano is 27.5 hz. to fit inside the piano the string for the low note can't be longer than 1.20 m. if it takes the full length, what is the speed of the wave in the string?

Initially, a particle is moving at 5.33 m/s at an angle of 37.9° above the horizontal. two seconds later, its velocity is 6.11 m/s at an angle of 54.2° below the horizontal. what was the particle's average acceleration during these 2.00 seconds in the x-direction (enter first) and the y-direction?