Two blocks,joined by a string,have masses of 6.0 and 9.0 kg.They rest on a frictionless horizontal surface.A 2nd string,attached only to the 9-kg block,has horizontal force = 30 N applied to it.Both blocks accelerate.Find the tension in the string between the blocks.
A)18 N
B)28 N
C)12 N
D)15 N

Question

Quizplus · Accepted Answer

The total mass of the system is 15 kg (6 kg + 9 kg). The acceleration of the system is the force divided by the total mass: 30 N / 15 kg = 2 m/s². The tension in the string between the blocks is the force needed to accelerate the 6 kg block: 6 kg * 2 m/s² = 12 N.

Two Blocks,joined by a String,have Masses of 6