A car travels from rest to a speed of 20 m/s in 5 seconds. What is its acceleration?
Using Newton's second law of motion: $$F - f = ma$$, where $F$ is the applied force, $f$ is the frictional force, $m$ is the mass, and $a$ is the acceleration.
$$20 - f = 5 \times 2$$
$$10 = \mu \times 5 \times 9.8$$
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Given: $F = 20$ N, $m = 5$ kg, $a = 2$ m/s² A car travels from rest to a speed of 20 m/s in 5 seconds
$$f = 20 - 10 = 10$$ N