# A force of 4.9 N acted on the body for 10 s. Find the mass of the body if the change in speed

A force of 4.9 N acted on the body for 10 s. Find the mass of the body if the change in speed as a result of the action of the force was 5 m / s.

t = 10 s.

F = 4.9 N.

ΔV = 5 m / s.

m -?

According to 2 Newton’s law, the mass of a body m can be found by dividing the force F, which acts on the body, by the acceleration that this force imparts to it: m = F / a.

The acceleration of a body is a vector physical quantity that shows how the body’s velocity ΔV changes over time t and is determined by the formula: a = ΔV / t.

The formula for determining body weight m will take the form: m = F * t / ΔV.

m = 4.9 N * 10 s / 5 m / s = 9.8 kg.

Answer: the body has a mass m = 9.8 kg.

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