Two forces of 5N and 12N act at right angles at the same point on an object. Find by scale drawing and calculation the resultant force which is equal in magnitude
and direction to the combined effect of the two forces​

Momentum, a quantity of motion of a moving body, is mathematically defined as mass x velocity. Hence the magnitude of momentum of a 25-kg mass traveling at 40 m/s is 40x25 = 1000 kg-m/s. As momentum is directional in nature, momentum = (1000i + 0j + 0k) kg-m/s in vector notation (as body is traveling east)