Answer to Question #117745 in Mechanics | Relativity for ran li

Question #117745
A car with a mass of 1.2 x 103
kg is travelling at a speed of 12.4 m/s. What is the cars kinetic energy?
a) 92 J
b) 1.9 x 102
J
c) 7.7 x 103
J
d) 9.2 x 104
J
1
Expert's answer
2020-05-25T10:58:30-0400

The kinetic energy of a car

"KE=\\frac{mv^2}{2}\\\\\n=\\frac{1.2\\times 10^3\\:\\rm kg\\times (12.4\\:\\ m\/s)^2}{2}=9.2\\times 10^4\\: \\rm J"

Answer: d)


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