mandilandfriedp1h53k
mandilandfriedp1h53k mandilandfriedp1h53k
  • 24-01-2019
  • Physics
contestada

A 53.4 kg girl is at rest on 3.55 kg skateboard. She jumps forward at 1.32 m/s. What is the velocity of the skateboard afterword?

A 534 kg girl is at rest on 355 kg skateboard She jumps forward at 132 ms What is the velocity of the skateboard afterword class=

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JemdetNasr JemdetNasr
  • 03-02-2019

M = mass of the girl = 53.4 kg

m = mass of skateboard = 3.55 kg

V' = velocity of the combination of girl and skateboard before she jumps forward = 0 [tex]\frac{m }{s}[/tex]

V = velocity of the girl forward = 1.32 [tex]\frac{m }{s}[/tex]

v = velocity of the skateboard afterward = ?

Using conservation of momentum

(M + m) V' = MV + m v

inserting the values

(53.4 + 3.55) (0) = (53.4) (1.32) + (3.55) v

v = - 19.86 [tex]\frac{m }{s}[/tex]

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