I will give brainliest to whoever is first

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

Avalue that describes how heavy an object is and is related to the force of gravity is

The passage that directs air to the lungs is called a. diaphragm. b. larynx. c. bronchi. d. pharynx.