# 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 × …………… or Force = …………….. or 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.

(a) equal; opposite (As per Newton’s third law)

(b) Vector; kg m/s (As momentum is the product of mass and velocity and velocity is a vector quantity)

(c) Acceleration; rate; momentum

(d) Magnitude; directions (Conservation of momentum)

(e) Momentum; force; (Explained in conservation of momentum)

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