A boy of mass m kg boards a trolley of mass 2m moving with constant speed u along a horizontal track. Neglecting friction, if the boy jumps vertically up with reference to the trolley to catch hold of a branch of a tree, the speed of trolley after the boy has jumped off is
A
u
B
2w
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
By conservation of momentum
(m + 2m) u = mu + 2mV
or 3mu = mu + 2mV
or V = u the vertical motion does not affect the horizontal motion. Hence the trolley moves with u.
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