SITUATION. The figure below shows a pellet about to be fired from a sling. The total unstretched length of the rubber band is 60 mm . The rubber band elongates 1 mm for every 15 N force. Given: \( a=100 \mathrm{~mm}, b=40 \mathrm{~mm} \)
What is the pulling force?
1500
3000
2115
1235