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[tex]\boxed{\rm 1}\\\sf 60rpm\div60=1 hz\\\sf f=1 hz\\\sf T=\dfrac{1}{f}= 1~s[/tex]
[tex]\boxed{\rm 2}\\\sf P=m\cdot g\\\sf P=70\cdot 9,8\\\sf P=686~N[/tex]
[tex]\boxed{\rm 3}\\\sf k=\dfrac{1}{2}\cdot m\cdot v^2\\\sf k=\dfrac{1}{2}\cdot5\cdot10^2\\\sf k=\dfrac{5\cdot100}{2}\\\sf k=\dfrac{500}{2}\\\sf k=250~J[/tex]
[tex]\boxed{\rm 4}\\\sf E_p=m\cdot g\cdot h\\\sf E_p=5\cdot9,8\cdot 10\\\sf E_p=490~J[/tex]
