# A body with a mass of 10 kg, moving at a speed of v1 = 20m / s, increased its speed to a value of v2

May 29, 2021 | education

| **A body with a mass of 10 kg, moving at a speed of v1 = 20m / s, increased its speed to a value of v2 = 30m / s. Is the work done?**

To find the work expended to increase the speed of movement of a given body, we apply the formula: A = ΔEk = 0.5 * m * (V2 ^ 2 – V1 ^ 2).

Values of variables: m – body weight (m = 10 kg); V0 is the speed reached by the body (V2 = 30 m / s); V1 – initial speed of movement (V1 = 20 m / s).

Calculation: A = 0.5 * m * (V2 ^ 2 – V1 ^ 2) = 0.5 * 10 * (30 ^ 2 – 20 ^ 2) = 2.5 * 10 ^ 3 J = 2.5 kJ.

Answer: To increase the speed of a given body, work of 2.5 kJ was performed.

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