Solve number 4

Step 1: Use the formula for final velocity under constant acceleration.

$v = u + at$

Initial velocity $u = 0$ m/s, acceleration $a = 2$ m/s², time $t = 5$ s.

Substitute values:

$v = 0 + (2)(5)$

Simplify:

$v = 10$ m/s

Final answer: 10 \ \mathrm{m/s}