A 40 kg crate is at rest. Two people push it the same way with 150 N and 110 N; friction is 180 N…

Step 1. Net force. $150\ \text{N} + 110\ \text{N} - 180\ \text{N} = 80\ \text{N}$.

Step 2. Acceleration. $\dfrac{80\ \text{N}}{40\ \text{kg}} = 2\ \text{m/s}^2$.

Step 3. (b) $v = 2\ \text{m/s}^2 \times 5\ \text{s} = 10\ \text{m/s}$.

Step 4. (c) $s = \tfrac12 \times 2\ \text{m/s}^2 \times 25\ \text{m} = 25\ \text{m}$.