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7. A 77 kg girl and a 62 kg boy face each other on friction free roller skates. The girl pushes the boy, who moves away at a speed of 2.5 m/s. What is the girl's speed? ​

Respuesta :

Sᴘᴀᴄᴇ7

Answer:

[tex]\sf\longmapsto \: 2.0m/s[/tex]

Explanation:

Initial momentum = 0

[tex]\sf\longmapsto \: 77 \: velocity + 62 \times 2.5 = 0[/tex]

[tex]\sf\longmapsto \: 77 \: velocity = - 155[/tex]

[tex]\sf\longmapsto \: velocity = \frac{ - 155}{77} [/tex]

[tex]\sf\longmapsto \: \: velocity = - 2.012[/tex]

[tex]\sf\longmapsto \: 2.0 \: m/ s[/tex]

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