a) In a frame of reference S1 , though the net force is zero, the net acceleration is not zero. b) In a frame of reference S2, though the net force is not zero, the net acceleration is zero. c) In a frame of reference S3, the net acceleration is zero whenever the net force is zero

S 1 and S 3 are inertial and S 2 is non-inertial

S 1 and S 2 are non-inertial and S 3 is inertial

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a) In a frame of reference S₁ , though the net force is zero, the net acceleration is not zero.
b) In a frame of reference S₂, though the net force is not zero, the net acceleration is zero.
c) In a frame of reference S₃, the net acceleration is zero whenever the net force is zero

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S₁ and S₃ are inertial and S₂ is non-inertial

S₁ , S₂ , S₃ are inertial

S₁ and S₂ are non-inertial and S₃ is inertial

answer is B.

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In any inertial frame if the net force is zero the acceleration must be zero and Similarly when acceleration is zero, the force acting must be zero.

So S₁ and S₂ are not inertial frames.

And S₃ is an inertial frame.

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