# The speed of a material point changes according to the law v = 5-3t under the action of a force 6N what is the mass of the point.

September 20, 2021 | education

| To find the mass of a given material point, we use Newton’s second law: F = m * a, whence we express: m = F / a = F / V (t) ‘.

Values of functions and variables: F – force acting on a point (F = 6 N); V (t) is the law of speed variation (V (t) = 5 – 3t).

Let’s calculate: m = F / V (t) ‘= F / (5 – 3t)’ = 6 / (0 – 3 * 1) = 2 kg.

Answer: The given material point must have a mass of 2 kg.

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