PLEASE HELP ME!! Two train cars with the same mass (30,000 kg) are traveling in the same direction when they collide. Train Car A has a velocity of 10
m/s and Train Car B has a velocity of 5 m/s. What is their total momentum after the collision? Make sure to show all your work and
include proper units.
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Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples

A15,000 kg rocket traveling at +230 m/s turns on its engines. over a 6.0 s period it burns 1,000 kg of fuel. an observer on the ground measures the velocity of the expelled gases to be −1,200 m/s.

What is the role of the water cycle in maintaining freshwater levels in lake and rivers?