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A ball weighing 150g is moving with an initial velocityoverline(u)=(3overset(wedge)(i)+4overset(wedge)(j))ms^(-1) After being hit by the player its final velocity is overline(u)=(3overset(wedge)(i)+4overset(wedge)(j))ms^(-1)What is the magnitude of change in momentam in kg ms^(-1) |
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Answer» `1kg ms^(-1)` `= -2 mu` `-2xx(150)/(10000)[3hati+4hatj]` `=(3000)/(1000)[-3hati-4hatj]` `=-[(9)/(1)hati-(6)/(5)hatj]` Magnitude `Ipl =sqrt((81)/(100)+(36)/(25))=(15)/(10)` `1.5 kg m^(-1)S`Hence (C) is the right choice. |
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