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Q.

A particle of mass m is acted on by two forces of equal magnitude F maintaining their orientation relative to the velocity v as shown in figures (a, b and c). The momentum of the particle

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a

increases in (a), 

b

increases in (b)

c

the direction do not change in (c)

d

the magnitude and direction both change in (c)

answer is A.

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Detailed Solution

(a) Resultant force and velocity are parallel so velocity and momentum increases.

(b) Resultant force and velocity are antiparallel so velocity and momentum decrease.

(c) F and y are perpendicular to each other. So only direction of momentum change.

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