The of two objects and their distance from each other determine the gravitational force between them. ( this is my last science question on my homework)

Apendulum has a mass of 1.5 kg and starts at a height of 0.4 m. if it is released from rest, how fast is it going when it reaches the lowest point of its path? acceleration due to gravity is g = 9.8 m/s2. a. 2.8 m/s b. 0 m/s c. 5.9 m/s d. 4.3 m/s

In what direction does the medium move relative to the direction of the wave? explain.

Need this now! do pilots live long