Cardio coasting is detrimental to a fitness routine because a. it can cause extreme weight gain. b. it can increase the chance of injury. c. it can increase the chance of a heart attack. d. the lack of variation in activity can lead to boredom and eventually cause exercise to stop.

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.