solve for m_boy:
0 = (8kg)(2.9m/s) + (m_boy + 1.9kg)(−0.57m/s)
0 = (8kg)(2.9m/s) + (m_boy + 1.9kg)(−0.57m/s)
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Come on man, seriously? I understand that the other problems have a scientific perspective you must add to solve them, but this is a simple algebra problem. You need serious academic help. I'll help you anyways.
0=22.12 + m_boy(-.57)
-22.12=m_boy(-.57)
m_boy=38.8 kg
0=22.12 + m_boy(-.57)
-22.12=m_boy(-.57)
m_boy=38.8 kg
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0 = (8kg)(2.9m/s) + (m_boy + 1.9kg)(−0.57m/s)
0 = 8x2.9 + (m + 1.9) x-0.57
0 = 23.2 -0.57m - 1.9x0.57
0 = 23.2 - 0.57m - 1.083
0 = 22.117 - 0.57m
0.57m = 22.117
m = 22.117/0.57 = 38.80kg
0 = 8x2.9 + (m + 1.9) x-0.57
0 = 23.2 -0.57m - 1.9x0.57
0 = 23.2 - 0.57m - 1.083
0 = 22.117 - 0.57m
0.57m = 22.117
m = 22.117/0.57 = 38.80kg
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38.8 kg