What must be happening, according to Newton's second law of motion, if a rigid body of unchanging mass is observed accelerating? A force is being applied to the mass. A force was once applied but is now

What must be happening, according to Newton's second law of motion, if a rigid body of unchanging mass is observed accelerating?

A force is being applied to the mass.

A force was once applied but is now not being applied.

The mass must be changing.

No force was or is being applied to the mass.

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What must be happening, according to Newton's second law of motion, if a rigid body of unchanging mass is observed accelerating? A force is being applied to the mass. A for…

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