A stone thrown from the Earth’s surface at a speed of 10 m / s had a kinetic energy of 5 J
| May 27, 2021 | education
A stone thrown from the Earth’s surface at a speed of 10 m / s had a kinetic energy of 5 J at the top point of the trajectory. Determine the mass of the stone.
The mass of a stone can be expressed from the following formula:
Ek = m * V² / 2, where Ek is the kinetic energy of the thrown stone (Ek = 5 J), m is the required mass of the stone (kg), V is the speed of the stone (V = 10 m / s).
m = 2Ek / V².
Let’s make a calculation:
m = 2Ek / V² = 2 * 5/102 = 10/100 = 0.1 kg.
Answer: The weight of the thrown stone is 0.1 kg or 100 g.
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