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A point mass having mass M is moving with a velocity V at an angle θ to the wall as shown in the figure. The mass undergoes a perfectly elastic collision with the smooth wall and rebounds. The total change (final minus initial) in the momentum of the mass is
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- –2MV cos θ ĵ
- 2MV sin θ ĵ
- 2MV cos θĵ
- –2MV sin θĵ
Correct Option: D
Pi = MV cosθî + MV sinθĵ
Pf = MV cosθî - MV sinθĵ
Pf - Pi = - 2MV sinθĵ