Question

1. what is the average net force needed to accelerate a 1600 kg car to a speed of 28 m/s in a time of 8 s?

Explanation:

Step1: Calculate acceleration

Acceleration is change in speed over time.
$$a = \frac{\Delta v}{t} = \frac{28\ \text{m/s} - 0\ \text{m/s}}{8\ \text{s}} = 3.5\ \text{m/s}^2$$

Step2: Apply Newton's second law

Force equals mass times acceleration.
$$F = m \times a = 1600\ \text{kg} \times 3.5\ \text{m/s}^2$$

Answer:

$5600\ \text{N}$