CBSE Class 9 Answered

Newton's first law of motion - 

An object at rest remains at rest, or if in motion, remains in motion at a constant velocity unless acted on by a net external force.

Newton's second law of motion states that rate of change of momentum of an object is directly proportional to the applied force and takes place in the direction in which the force acts. 

Thus, 

 

Where, 

F - Force applied

m - mass

v - final velocity of an object 

u = initial velocity of an object

 

Newton's third law of motion - 

For every action there is equal and opposite reaction.