a 20 kg bike accelerates at 10 m/s². what was the force

Explanation:

Step1: Identify the formula

Newton's second law: $F = ma$ (where $F$ is force, $m$ is mass, $a$ is acceleration)

Step2: Substitute the values

$m = 20,\text{kg}$, $a = 10,\text{m/s}^2$. So $F=20\times10$

Step3: Calculate the result

$F = 200,\text{N}$

Answer:

$200,\text{N}$