The force required to produce an acceleration of 5 ms^-2 in a body of mass 2 kg is:

1. 2.5 N
2. 20 N
3. 10 N
4. 25 N

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

1 Newton is equal to :

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