This skateboarding child only needs 8 seconds to make it the 28 meters down the length of a basketball court. What is the average velocity (in m/s) required to make this happen?

Curious carl calculated the density of a cube to be 4.50 g/cm3. what is the density of the cube in g/l?

Aforklift raises a 1,020 n crate 3.50 m up to a shelf. how much work is done by the forklift on the crate? the forklift does j of work on the crate.

Asolid cylinder and a cylindrical shell have the same mass, same radius, and turn on frictionless, horizontal axles. the cylindrical shell has light-weight spokes connecting the shell to the axle. a rope is wrapped around each cylinder and tied to blocks of equal masses that are held the same height above the ground. both blocks are released simultaneously. the ropes do not slip. which block hits the ground first? or is it a tie?