Question

Q1.A force of 2N acting on a body changes its velocity uniformly from 2m/s to

5m/s in 10s. Calculate the mass of the body.​

Answer 1

Explanation:

✬ 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 formula 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.