Question

a diagram shows a block with a 30n force (left - directed arrow) and a 10n force (right - directed arrow) acting on it.

Explanation:

Step1: Identify force directions

Forces are opposite: left force $F_1 = 30N$, right force $F_2 = 10N$.

Step2: Calculate net force

Net force $F_{net}=F_1 - F_2$ (since opposite directions, subtract magnitudes).
$F_{net}=30N - 10N = 20N$.
Direction: same as larger force (left).

Answer:

The net force is $20N$ to the left.