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a physics question? The answer book shows the following: Initial momentum = m x v = mv Final momentum = (m x 1/2v) + (m x 1/2v) = mv How come the answer is not 2mv.The 1/2v's added up to give v, why doesn't m + m give 2m?? Thx!

Two forces are of magnitude 320N and 240N respectively. Determine by drawing a vector diagram in each case: a)the maximum magnitude of their resultant force b) the minimum magnitude of their resultant force I do know the answers, 560N and 80N....however, my problem is drawing them........do...