Answer:
147.896m/s.
Explanation:
initial velocity(u) = 0, since it started from rest.
acceleration (a) = 9.73m/s2
time taken (t) = 15.2s
Using the first equation of motion:
v = u + at
v = 0 + 9.73(15.2)
v = 147.896m/s
hence the velocity at the takeoff is 147.896m/s.