- #1
leena19
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Homework Statement
2 boys of identical masses are standing on 2 identical trolleys A and B(facing each other) which are at rest on a frictionless horizontal surface.The boy on trolley A then throws a ball of mass m horizontally with velocity V with respect to the Earth and the boy o trolley B catches it.If the mass of a trolley with a boy is M,the respective final velocities of trolleys A and B are
1) -mV/M and -mV/M+m
2)-mV/M+m and mV/M+m
3) -mV/M and mV/M+m
4) -mV/M-m and mV/M+m
5) -V and V
Homework Equations
The Attempt at a Solution
momentum before = after
mV = (M+m ) VB - MVA
conservation of energy
1/2mV2 = 1/2 MVA2 + 1/2(M+m)VB2
and VA = [tex]\sqrt{[mV^{2}-(M+m)VB^{2}/M]}[/tex]
which just looks so wrong,i'm too afraid to continue.
Hope someone can help.
Thanx