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

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

Expert's answer

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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