Question

two people push a heavy box. sarah pushes to the right with a force of 80 n. at the same time, david pushes to the left with a force of 50 n. what is the net force on the box? 130 n to the right 30 n to the right 30 n to the left 130 n to the left

Explanation:

Step1: Define positive - direction

Let the right - direction be positive. So Sarah's force $F_{S}=80N$ and David's force $F_{D}=- 50N$.

Step2: Calculate net force

The net force $F_{net}=F_{S}+F_{D}=80+( - 50)$.
$F_{net}=80 - 50=30N$. Since the result is positive, the direction is to the right.

Answer:

B. 30 N to the right