Question

After a day of testing race cars you decide to take your own 1550-kg car onto the test track while moving down the track at 10.0m/s you uniformly accelerate to 30.0m/s in 10.0s what is the average net force that the track has applied to the car during the 10.0s interval

Answer 1

After a day of testing race cars you decide to take your own 1550-kg car onto the test track while moving down the track at 10.0m/s you uniformly accelerate to 30.0m/s in 10.0s what is the average net force that the track has applied to the car during the 10.0s interval

Solution:

Let:

$$m = 1550\ \mathrm{kg}$$ $$v_0 = 10\ \mathrm{m/s}$$ $$v = 30\ \mathrm{m/s}$$ $$t = 10\ \mathrm{s}$$

F—?

F = ma, were a - acceleration

$$a = \frac{v - v_0}{t},$$ $$F = m \frac{v - v_0}{t}$$ $$F = 1550 \frac{30 - 10}{10} = 3100\ \mathrm{N}$$

Answer: the average net force is: 3100 N.