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Physics
Physics
Problem
A particle of mass
m
m
m
with an initial velocity
u
i
^
u\hat{i}
u
i
^
collides perfectly elastically with a mass
3
m
3m
3
m
at rest. It moves with a velocity
v
j
^
v\hat{j}
v
j
^
after collision, then,
v
v
v
is given by: (a)
v
=
2
3
u
v = \sqrt{\frac{2}{3}}u
v
=
3
2
u
(b)
v
=
u
3
v = \frac{u}{\sqrt{3}}
v
=
3
u
(c)
v
=
u
2
v = \frac{u}{\sqrt{2}}
v
=
2
u
(d)
v
=
1
6
u
v = \frac{1}{\sqrt{6}}u
v
=
6
1
u
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