Example 9.7 A girl of mass 40 kg jumps
with a horizontal velocity of 5 ms' onto
a stationary cart with frictionless
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.
Answers
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no external force => momentum is constant.
momentum of girl = 40 * 5 = 200 kg-m/sec
momentum of girl and cart = total momentum of the girl + momentum of cart
= 200 + 0 = 200 kg m/sec
speed = 200 / (40 + 3)
= 4.65 m/sec
Hope it's helpful dear
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