Question

How fast must a 1000 kg car be moving to have a kinetic energy of 2.0×10^5 j


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Answer 1

KE= 1/2mv^2

where KE= 2.0*10^5j

Answer 2

Step-by-step explanation:

`kinetic \: energy= (1)/(2) m {v}^(2)`

`2 * {10}^(5) = (1)/(2) 1000 {v}^(2)`

`2 * {10}^(5) = 500 {v}^(2)`

`\frac{2 * {10}^(5) }{500} = {v}^(2)`

`{v}^(2) = 400`

`v = 20`