2. Forces and accelerations Consider the following situations. In each case, say whether or not a net force has been applied to the object and explain your answer in a sentence or two. (a) You see a car that is going around a curve in a road, and is moving at 30 miles per hour the entire time. (b) You see a ball rolling in a straight line at 1 mile per hour the whole time. (c) You see a car that is moving in a straight line. While you are watching its speed changes from 100 km/hr to 60 km/hr.