The mathematical expression of Newton's second law of motion is:

1. F = m x v
2. F = m x a
3. F = pv
4. F = m/a

The acceleration produced in a body by a force of given magnitude depends on —

1. size of the body
2. shape of the body
3. mass of the body
4. None of these

The S.I. unit of force is:

1. dyne
2. g cm s^-2
3. Newton
4. Joule