Question: Two objects are push apart by a spring. Object A has mass 20 kg and accelerates at 40 m/sec. What is the acceleration of object B if its mass is 80 kg?

Answer 1/2
The question merely wants you to recognize that the force the spring is applying to object A is equal and opposite to the force the spring is applying to object B.

Recall that F = m * a .

For object A, mass is 20 kg and acceleration is 40 m / s^2 . So the force the spring applies to object A is:

F = (20 kg) * (40 m / s^2) = 800 N

To determine the acceleration on object B, use this force and the mass of object B:

a = (800 N) / (80 kg) = 10 m / s^2

The answer is: the acceleration of object B is 10 m / s^2 .
by Regulus
Answer 2/2
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