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Question:

In which case would the particle move in a straight line along the negative direction of y-axis (i.e., move along -^y)?

(III)(ii)(P)

(II)(iii)(Q)

(III)(ii)(R)

(IV)(ii)(S)

Solution:

For particle to move in -ve y-direction, either its velocity must be in -ve y-direction (if initial velocity is not equal to zero) force should be parallel to velocity or it must experience a net force in -ve y-direction only (if initial velocity = 0)