Fill in the following blanks with suitable words:
(a) To every action, there is an…..and….reaction
(b) Momentum is a…….quantity. Its unit is……
(c ) Newton's second law of motion can be written as Force=mass`xx`…….or Force=………….of change of..........
(d) Forces in a Newton's third law pair have equal......but act in opposite.....
(e) In collisions and explosions, the total.......remains constant, provided that no external........acts.

Answer

(a) equal; opposite (b) vector ; kg.m/s (c) acceleration ; rate ; momentum (d) magnitude; directions (e) momentum;force