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msanger7587
21.03.2020 •
Physics
A 39 kg girl runs across a mat with a speed of 4.8 m/s and jumps onto a 125 kg hanging platform initially at rest, causing the girl and platform to swing back and forth like a pendulum together after her jump. What is the combined velocity of the girl and platform (in m/s) after the jump?
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Ответ:
The combined velocity of the girl and the platform after the jump is 1.14 m/s.
Explanation:
From the law of conservation of momentum:
m1u1 = (m1 + m2)v
m1 is mass of the girl = 39 kg
m2 is mass of the hanging platform = 125 kg
u1 is initial speed of the girl = 4.8 m/s
v is combined velocity of the girl and the platform after the jump
v = m1u1/(m1+m2) = 39×4.8/(39+125) = 187.2/164 = 1.14 m/s
Ответ:
OTF
Explanation: