Question

Hello I need help with question 7 a and b please

Answer 1

Given data:

* The mass of the child is 40kg.

* The reading of the scale is 30 N.

Solution:

(a). The free body diagram of the given system is,

(b). The weight of the child is,

`\begin{gathered} W=40*9.8 \\ W=392\text{ N} \end{gathered}`

The Scale reading is,

`N=30\text{ Newton}`

The net force acting on the box in terms of the weight of the box is,

`\begin{gathered} F_{\text{net}}=N-mg \\ F_{\text{net}}=30-392 \\ F_{\text{net}}=-362\text{ N} \end{gathered}`

According to the Newton's second law,