1. how much force is needed to accelerate a 66 kg skier at 2 m/sec²?

Explanation:

Step1: Identify the formula

We use Newton's second - law $F = ma$, where $F$ is force, $m$ is mass and $a$ is acceleration.

Step2: Substitute the given values

Given $m = 66\ kg$ and $a=2\ m/s^{2}$, then $F=66\times2$.

Step3: Calculate the force

$F = 132\ N$.

Answer:

$132\ N$