Question

After a big snowfall, you take your favorite rocket‑powered sled out to a wide field. The field is 205 m across, and you know that your sled accelerates at a rate of 3.95 m/s2 when the rocket is on. How fast will the sled be moving when it is halfway across the field?

Answer 1

Below

Explanation:

Find time to get to 102.5 m (Half of the field)

d = 1/2 a t^2

102.5 = 1/2 * 3.95 t^2 shows t = 7.2 s

then v = at

= 3.95 * 7.2 = 28.5 m/s