a 16 gram mass moving with plus x direction at 30 cm per second while a program mass is moving with a velocity of 50 M per second . They collide head on together find the velocity after collision

Dear Student,

Your question seems to be incomplete. Please refer to the below solution which is similar to your query: 
 
Conversion:  30 cm/s = 30/100 m/s = 0.3 m/s
Take, m1 = 16 g, m2 = not given,  u1 = 0.3 m/s  u2 = 50 m/s (sign not given).   

Given that

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