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Two balls roll toward each other. The red ball has a mass of 0.5 kg and a speed of 4m/s just before impact. The green ball has a mass of 0.3 kg and a speed of 2 m/s. if the collision is perfectly inelastic, determine the velocity of the composite object after the collision. |
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Answer» Solution :If the collision is perfectly inelastic, then, by DEFINITION, the masses STICK together after impact, moving with a velocity, v. applying CONSERVATION of linear momentum, we FIND total `p_("before")=`total `p_("after")` `m_(red)v_(red)+m_("green")v_("green")=(m_(red)+m_("green"))v'` `(0.5)(+4)+(0.3)(-2)=(0.5+0.3)v'` `v'=+1.8m//s` |
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