coltongagedean coltongagedean
  • 03-03-2020
  • Physics
contestada

If a stone has 390 J of energy and is moving with
a speed of 12 m/s, what is the mass of the stone?

Respuesta :

ellaleicht ellaleicht
  • 03-03-2020

Answer:

5.4 g

Explanation:

The stone is already in motion, so the only energy it has is kinetic. The formula for kinetic energy is:

[tex]KE=\frac{1}{2} mv^{2}[/tex]

You can substitute the 390 J in for KE and 12 m/s in for v. After that, the equation looks like:

[tex]390=\frac{1}{2} m12^{2}[/tex]

Then do basic algebra and m=5.4 g

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