Question

If a body has a mass of 42 kg in weighing machine then what will ne its mass

Answer 1

As we know that ; weight is the force exerted by earth.

g=10m/s^2
So,
Fnet= m× acc.
42= m × 10
m = 4.2 kg ( ans.)

Answer 2

Given:

• Weight (w) = 42 kg
• Acceleration due to gravity (g) = 9.8 m/s²

To Find:

• Actual Mass of the body?

Formula Used:

$\\ \bullet{\underline{\boxed{\sf\orange{ Weight = Mass \times acceleration \ due \ to \ gravity }}}}$

Solution:

After substituting values in the formula to get mass of the body,

$\colon\implies{\sf{ 42 = M \times 9.8 }} \\ \\ \colon\implies{\sf{ \cancel{ \dfrac{42}{9.8} } = M }} \\ \\ \colon\implies{\sf{ M = 4.2 \ Kg }}$

Hence,

The Mass of the body is 4.2 kilograms.

Remarks:

• A = Acceleration
• W = Weight
• M = Mass
• SI unit of Mass is Kilograms.
• The Mass of the body is constant and does not change from place to place.