For free expansion of the gas which of the following is true?

1.
For free expansion of the gas which of the following is true?

1.  and 2.  and 3.  and 4.  and 

1. Bond energy &prop; bond order &prop; bond length2. 3. 4.

1. No acceleration is involved2. Centripetal force acts radially inward3. Centrifugal force balances centripetal4. Car has zero net force

1. No force is applied2. Wall applies no force3. Forces are unbalanced4. Action and reaction forces are equal and opposite

1. Net force on the man is zero2. Man is accelerating upwards3. Weight is greater than normal force4. Normal force is greater than weight