The acceleration due to gravity is equal to second squared. (round to 2 significant digits)

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 substance is 4.0 g/cm3. if a sample of the substance has a volume of 25 cm3 then what is the mass

Using the work energy theorem. what is the velocity of a 850kg car after starting at rest when 13,000j of work is done to it.