If a car travels 12.0 km south then 5.0 km north in 0.25 hr what is it’s average velocity? it’s average speed

A6,600 kg train car moving at +2.0 m/s bumps into and locks together with one of mass 5,400kg moving at -3.0m/s. what is their final velocity? +0.50 m/s -1.0 m/s +2.5 m/s -0.25 m/s

What is the weight of a 8-kg substance in n, kn, kg·m/s2, kgf, lbm·ft/s2, and lbf?

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat