According to the second Newton's law
Ma=TMa=TMa=T
mg−T=mamg-T=mamg−T=ma
m1g−N=m1am_1g-N=m_1am1g−N=m1a
So, we get
N=m1g−m1mgM+mN=m_1g-m_1\frac{mg}{M+m}N=m1g−m1M+mmg
Assume that the man has a mass m1=60kgm_1=60 kgm1=60kg . Finally
P=N=m1g−m1mgM+m=60⋅9.81−60⋅440⋅9.812000+440=482NP=N=m_1g-m_1\frac{mg}{M+m}=60\cdot9.81-60\cdot\frac{440\cdot9.81}{2000+440}=482 NP=N=m1g−m1M+mmg=60⋅9.81−60⋅2000+440440⋅9.81=482N
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