qpzyrhh9iy qpzyrhh9iy
  • 23-01-2021
  • Physics
contestada

can anyone help me with this last question?

can anyone help me with this last question class=

Respuesta :

mberisso
mberisso mberisso
  • 23-01-2021

Answer:

v = 39.6 m/s (first answer option)

Explanation:

Use conservation of mechanical energy.

The starting is completely potential energy and the final is all kinetic energy:

[tex]m*g*h=\frac{1}{2}*m*v^2\\g * h=\frac{1}{2} v^2\\9.8*80=\frac{1}{2} v^2\\v^2=1568\\v\approx 39.6\,\,m/s[/tex]

which agrees with the first answer shown.

Answer Link

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