Question

In an engineering test, a rocket sled is propelled into a target. The sled’s distance d in meters from the target is given by the formula d = -1.5t2 + 120, where t is the number of seconds after rocket ignition. How many seconds have passed since rocket ignition when the sled is 10 meters from the target?

Answer 1

You're given d = 10
10 = -1.5t2 = 110
$t^{2}$ = 220/3
since t $\geq$ 0
t = $\sqrt 220/3$
I apologize if this is wrong!