Three masses which are connected by a massless spring are shown in the figure. What will be the value of force F2?
Correct answer: C. 24N
- A. 15N
- B. 18N
- C. 24N
- D. 30N
Explanation
The following is the solution: The force on mass 2 is equal to the sum of the forces on masses 1 and 3, but since the spring is massless, the forces on masses 1 and 3 are equal in magnitude but opposite in direction. Therefore, the force on mass 2 is 2x15 N/2 = 24 N.
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