3) How far will 20 N of force stretch a spring with a spring constant of 140 N/m? How far will a 50N Force stretch the same spring?

7 meters, 2.8 meters

Explanation:

work done (nm) = force (n) * distance (m)

140= 20 * m

140/20 = m

m=7 meters

140= 50 * m

140/50 = m

m= 2.8 meters

prolly a beacuse the momentuem the car has increases while going down hill

change tension