Can anyone help me solve for this whole table? I think if I tried doing it I will probably get the wrong answers

Atransverse wave is traveling on a string stretched along the horizontal x-axis. the equation for the vertical displacement y of the string is given by y = (1.8 x 10-3)cos[π(13x - 60t)], where all quantities are in si units. what is the maximum speed of a particle of the string

The density of a liquid could be found by using

Which quantities are scalars? choose all that apply a.distance b.speed c. acceleration d.velocity