- #1
whereisccguys
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A 0.308 kg croquet ball makes an elastic head-on collision with a second ball initially at rest. The second ball moves off with half the original speed of the first ball. What is the mass of the second ball?
so i used the formula m1v1initial + m2v2initial = m1v1final + m2v2final
v2initial=0 therefore m1v1initial = m1v1final + m2v2final
i know that v1initial = v1final + v2final
and the questions tells me v2final = (1/2)v1initial
i plug everything in and i get m1(1/2)v1initial = m2(1/2)v1initial
therefore m1 = m2... but it's the wrong answer
anyone know what i did wrong?
so i used the formula m1v1initial + m2v2initial = m1v1final + m2v2final
v2initial=0 therefore m1v1initial = m1v1final + m2v2final
i know that v1initial = v1final + v2final
and the questions tells me v2final = (1/2)v1initial
i plug everything in and i get m1(1/2)v1initial = m2(1/2)v1initial
therefore m1 = m2... but it's the wrong answer
anyone know what i did wrong?