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I tried solving this question by applying conservation of momentum. Like this, speed=20/5=4m/s So,(v1+4)40+(-v2+4)40=0 But,i am getting wrong answer! Please answer this question and also tell me where i was doing wrong.

I tried solving this question by applying conservation of momentum. Like this,
speed=20/5=4m/s
So,(v1+4)40+(-v2+4)40=0
But,i am getting wrong answer!
Please answer this question and also tell me where i was doing wrong. 
 

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Grade:12

1 Answers

randheer
19 Points
5 years ago
the final velocity of system = 20/5 = 4m/s
total final momentum = (40+40+20)*4 = 400kg.m/s
V1(wrt ground) = V1+4
V2 (wrt groung) =   V2-4
initial momentum = final momentum
40*V1-40*V2 = 400kg.m/s
 V1-V2 = 10.
Solve about COM.
 
 
 

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