Se sabe que:
Em = Ec + Ep
Donde:
Sustituyendo las expresiones para Ec y Ep:
[tex]E_m = \dfrac{mv^2}{2} + mgh[/tex]
[tex]E_m =m\left( \dfrac{v^2}{2} + gh\right)[/tex]
[tex]m =\dfrac{E_m}{\dfrac{v^2}{2} + gh}[/tex]
[tex]m = \dfrac{7831.5 \ J }{\frac{(2.50\ m/s)^2}{2} + (9.8\ m/s^2)(13\ m)}[/tex]
[tex]m = \dfrac{7831.5 \ J }{3.125\ m^2/s^2 + 127.4\ m^2/s^2}[/tex]
[tex]m = \dfrac{7831.5 \ J }{130.525\ m^2/s^2 }\\[/tex]
[tex]m = \dfrac{7831.5 \ kg\cdot m^2/s^2 }{130.525\ m^2/s^2 }\\[/tex]
[tex]\boxed{m = 60\ kg}[/tex]
Finalmente el peso del cuerpo será:
P = mg = 60 kg * 9.8 m/s² = 588 N
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Se sabe que:
Em = Ec + Ep
Donde:
Sustituyendo las expresiones para Ec y Ep:
Em = Ec + Ep
[tex]E_m = \dfrac{mv^2}{2} + mgh[/tex]
[tex]E_m =m\left( \dfrac{v^2}{2} + gh\right)[/tex]
[tex]m =\dfrac{E_m}{\dfrac{v^2}{2} + gh}[/tex]
[tex]m = \dfrac{7831.5 \ J }{\frac{(2.50\ m/s)^2}{2} + (9.8\ m/s^2)(13\ m)}[/tex]
[tex]m = \dfrac{7831.5 \ J }{3.125\ m^2/s^2 + 127.4\ m^2/s^2}[/tex]
[tex]m = \dfrac{7831.5 \ J }{130.525\ m^2/s^2 }\\[/tex]
[tex]m = \dfrac{7831.5 \ kg\cdot m^2/s^2 }{130.525\ m^2/s^2 }\\[/tex]
[tex]\boxed{m = 60\ kg}[/tex]
Finalmente el peso del cuerpo será:
P = mg = 60 kg * 9.8 m/s² = 588 N
R/ El peso del cuerpo es de 588 N y expresado en kgf serían 60 kg.