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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