Which of the following is an example of projectile motion? a. a jet lifting off a runway b. a thrown baseball c. an aluminum can dropped straight down into the recycling bin d. a space shuttle being launched

Suppose that three astronomical objects, 1, 2, and 3 are observed to lie on a line, and the distance from object 1 to object 3 is d. object 1 has four times the mass of object 3, and seven times the mass of object 2. find the distance between objects 1 and 2 for which the net force on object 2 is zero.