You see lightning before you hear thunder because a) light waves can travel through a vacuum. b) sound waves cannot travel through the air. c) light waves travel faster than sound waves. d) sound waves travel faster than light waves

i think its c
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How many dots must be added to the symbol to properly represent a standard nitrogen ion? a) 1 b) 3 c) 5 d) 8

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?

Thomas his older brothers, who own a junk yard, on the weekends to earn extra money. he likes to them push broken-down cars to the back of the junk yard because it makes him feel strong. last saturday, they pushed three cars with different weights, and he noticed he used different amounts of force for each one. the cars were the following weights: white car: 2,700 kg red car: 1,500 kg blue car: 2,100 kg think about how much force is needed to move each car. which correctly lists the cars in order from the most to least amount of force needed to move them? a) white, blue, red b) blue, red, white c) red, white, blue d) white, red, blue