Question

A force of 2N acting on a body changes its velocity uniformly from 2m/s to
4m/s in 10 s. Calculate the mass of the body.
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Answer 1

Answer:

✬ Mass = 6.66 kg ✬

Explanation:

Given:

Force is 2 Newtons.

Initial velocity (u) is 2 m/s.

Final velocity (v) is 5 m/s.

Time is 10 seconds.

To Find:

What is the mass of body ?

Formula to be used:

Acceleration = (v – u)/t

Force = Mass \times× acceleration

Solution: First find the acceleration using formula

⟹ Acceleration = (5 – 2)/10

⟹ a = 3/10 m/s²

Let the mass of body be m.

Now, using the second forFormula i.e F = ma

⟹ Force = m \times× 3/10

⟹ 2N = 3m/10

⟹ 20 = 3m

⟹ 20/3 = m

⟹ 6.66 = m

Hence, the mass of body is 20/3 kg or 6.66 kg.