A spring of natural length 1.5cm is extended 0.0050m by a force of 0.12n what would be the length when the applied force is 36n
0.015 meters + (36 / 0.12) * 0.0050 meters
0.015 + 1.5
check for typos, maybe original length was 1.5 meters not centimeters. Otherwise I bet it broke.