Which of the following best illustrates the role that gravity played in the in the formation of the solar system? (a) gravity removed excess gas and dust from the cores of the planet (b) gravity pulled particles of dust and gas together to form planes (c) gravity caused the nebula to cool enough for planets to form (d) gravity allowed the nebula to expand and move outward

Which pair of sentences is describing the same velocity? a. a car is parked. a car is moving in circles. b. a bus drives 40 miles per hour north. a truck drives 50 miles per hour north. c. a boy walks east at 6 kilometers per hour. a girl walks west at the same speed as the boy. d. valerie rides her bike south at 8 kilometers per hour. owen jogs south at 8 kilometers per hour.