Determine the mass m of a body with kinetic energy = 4.5 mJ and moving uniformly with a speed of v = 15 m / s

univerkov | November 22, 2020 | education

Kinetic energy formula: E = mv2 / 2. From it we express the mass m 2E = mv2 -> m = 2E / v2. One mJ contains 1,000,000J. That is, the mass is equal to m = 2 × 4.5 × 1,000,000J / 15m / s2 = 40,000kg = 40tons.
Answer: 40 tons

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