A wall is connected to a mass of 6.0 kg by a string that passes over a massless, frictionless pulley. The string has a uniform mass of 0.327 kg and a length of 5.0 meters. A wave pulse traveling along the string has a wavelength of 0.24 meter. A) Find the speed of a wave pulse traveling along the string. B) Find the frequency of a wave pulse traveling along the string.

Marie throws a rock into the air from a height of 38 meters. The initial velocity of the rock is 25 meters per second at an angel of 30 degrees above the horizontal. Neglect air resistance. A) How long does it take for the rock to hit the ground? B) How far does the rock travel horizontally?