Question

(b) Suppose your mass is 42 kg. Express your weight in SI unit (Take g = 9.8 ms).
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Answer 1

Answer:

Use the formula weight = mass*gravity.

mass=42 kg and gravity=9.8 m/s

weight = 42*9.8=411.6

Answer 2

Suppose your mass is 42 kg. So, your weight in SI unit is 411.6 N.

• Mass of a body is the numerically the amount of matter present in a body. According to the  Laws of conservation of mass, Mass can never be created nor destroyed, the total mass in the universe is constant.
• But mass and energy can change forms.
• So, in SI system, the Unit of mass is in kilogram and the unit of weight is in Newton.
• Formula for weight (W) = mass * acceleration due to gravity
• So, W = m * g = 42 * 9.8 = 411.6 N