# Answer on Mechanics | Relativity Question for Shandee

Question #22614

The kinetic energy of a cougar that was moving at a speed of 35km/h was determined to be 4000J. What was the mass of the cougar?

Expert's answer

The kinetic energy of body of mass m moving at speed v isgiven by the formula

E = m v^2 / 2,

whencem = 2E / v^2.

In our case

m = 2 * 4000 / 35^2 = 8000 / 1225 = 6.53 kg

E = m v^2 / 2,

whencem = 2E / v^2.

In our case

m = 2 * 4000 / 35^2 = 8000 / 1225 = 6.53 kg

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