What are elements made up of?

atoms

matter

Hydrogen

substance

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?

The act of moving from one place to another. a. locomotor b. aerobic c. stationary d. static

If the work required to stretch a spring 3 ft beyond its natural length is 15 ft-lb, how much work is needed to stretch it 27 in. beyond its natural length?