onto
a stationary cart with friction less wheels. The mass of the cart is 3 kg. What
is her velocity as the cart starts moving? Assume that there is no external unbalanced
force working in the horizontal direction?
Answer:
Here, mass of the girl, 
Mass of cart, 
Horizontal velocity of girl when
the cart is stationary
Initial
momentum of system
(1)
Let the final velocity of girl
when the cart also starts moving with= v
Final
momentum of the system
(1)
As there is no horizontal
unbalanced force on the system.
Total final momentum = Total
initial momentum
(1)
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