If you travel 450 meters in 40 seconds, what is your average speed in meters per second?

A)11.25
B)40
C)450
D)18000

Can someone explain to me how to do this problem ?

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.

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?