Answer:
23.2 m/s
Explanation:
A jetpack appliang a force on a body would result in an acceleration following Newton's equation:
f = m * a
Rearranging:
a = f / m
The problem doesn't state a mass, so I'll use mine, which is
m = 72 kg
Then:
a = 334 / 72 = 4.64 m/s^2
The equation for speed under constant acceleration is:
V(t) = V0 + a * t
Since I was standing before turning the jetpack on
V0 = 0
So:
V(5) = 0 + 4.64 * 5 = 23.2 m/s