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It is m1/5
If both angles are supplementary and add up to 180 degrees then they are 109 degrees and 71 degrees respectively.
*Edit* M2 can print a box of paper in 3x plus 20 hours.
M1 is M multiplied by 1 in algebra.
Suppose the two masses are m1 and m2. Their initial velocities are u1 and u2 and final velocities are v1 and v2. Then, using conservation of momentum. m1*u1 + m2*u2 = m1*v1 + m2*v2 Both m1 and m2 are given. Their initial velocities u1 and u2 are given and one of the two final velocities v1 and v2 is given which leaves only one unknown. So substitute all those values and calculate away.