- #1

- 95

- 2

## Homework Statement

## Homework Equations

$F=ma$

## The Attempt at a Solution

(a) Because the spring scale weighs 250 N, the effective weight on the child's side is 230 N. Therefore, $T-230 = \frac{230}{9.8} a$ and $T-250 = -\frac{250}{9.8} a$, so $a = 0.408$.

This is correct, but is the solution really legitimate? The "effective weight" argument seems a bit suspicious and nonrigorous.

(b) I have no idea where to even start. How would the "effective weights" work here? (Or would it even work?)

Thanks,

minimario