Describe in your own words what is rectilinear motion and the associated variables that defines the particle position acceleration and velocity.

Lake Mead, near the Hoover Dam, which is the largest man-made lake in the United States, contains 28,537,000 acre-foot of water (an acre-foot is the amount of water required to cover 1 acre to a depth of 1 foot). Express the mass of the water volume in kg and lbm.