Let’s solve this step by step.
We are given:
> A baby’s average energy requirement per child per day is 40 kJ/kg. The average mass of the baby is 5 kg.
> How much energy does the baby need in one day?
---
Step 1: Understand what “40 kJ/kg” means
This means for every
kilogram of body weight, the baby needs
40 kilojoules (kJ) of energy per day.
---
Step 2: Multiply by the baby’s mass
The baby weighs
5 kg, so we multiply:
> 40 kJ/kg × 5 kg = ?
The “kg” units cancel out, leaving just kJ.
> 40 × 5 = 200
So, the baby needs
200 kJ per day.
---
Check:
- If 1 kg → 40 kJ
- Then 5 kg → 5 × 40 = 200 kJ
✔
No mistakes here.
---
Final Answer:
200 kJ
Parent Tip: Review the logic above to help your child master the concept of kinetic and potential energy worksheet answers.
