Answer to Question #305882 in Mechanics | Relativity for Kian

Question #305882

An object moving at 15 m/s has a kinetic energy of 8500 J. What must be the speed of the same object that has kinetic energy of 6300 J.

1
Expert's answer
2022-03-04T13:23:09-0500

Explanations & Calculations


  • It is about using the formula of kinetic energy repeatedly.
  • The mass of the object is unknown so getting it replaced yields the needed answer.

Ek=12mv28500=12m(152)(1)6300=12m(v2)(2)(2)÷(1),v2152=63008500v=63×15285ms1\qquad\qquad \begin{aligned} \small E_k&=\small \frac{1}{2}mv^2\\ \small 8500&=\small \frac{1}{2}m(15^2)\cdots(1)\\ \\ \small 6300&=\small \frac{1}{2}m(v^2)\cdots(2)\\ \\ \small (2)\div(1),\\ \\ \small \frac{v^2}{15^2}&=\small \frac{6300}{8500}\\ \small v&=\small \sqrt{\frac{63\times15^2}{85}}\,ms^{-1} \end{aligned}

  • Now you can get things simplified.

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