MEDAL GIVEN TO CORRECT ANSWER.
A model airplane with mass 1.3 kg hangs from a rubber band with spring constant 20 N/m. How much is the rubber band stretched when the model hangs motionless?

A. 0.23
B. 0.082 m
C. 0.64 m
D. 0.78 m

Question

MEDAL GIVEN TO CORRECT ANSWER. 
A model airplane with mass 1.3 kg hangs from a rubber band with spring constant 20 N/m. How much is the rubber band stretched when the model hangs motionless?

 		A.	0.23
 		B.	0.082 m
 		C.	0.64 m
 		D.	0.78 m

anonymous · Answer

Use Hooke's equation for Force of an object on the spring like the one I told you previously. Rearrange to find the displacement, x, and make sure you convert kg to newtons through multiplying by 9.8. Tell me what you get

anonymous · Answer

I'm getting C, show your workings