The S.I. unit of force is:

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

For a relation F = $\dfrac{m(Δv)}{Δt}$, to hold true, the condition(s) necessary is/are:

1. velocities are equal to the velocity of light
2. velocities are much smaller than the velocity of light
3. mass remains constant
4. both (b) and (c)

1 Newton is equal to :

1. 10³ dyne
2. 10⁸ dyne
3. 10¹⁰ dyne
4. 10⁵ dyne

According to Newton's second law of motion, the change in momentum takes place in a direction :

1. opposite to the direction of force applied
2. perpendicular to the direction of the force applied
3. similar to the direction of the force applied
4. none of these