A Model Rocket Flies Upward at Constant Acceleration,and Undergoes a Displacement

Multiple Choice

A model rocket flies upward at constant acceleration,and undergoes a displacement of 15.0 m during its first 0.25 s of travel.What was its speed at the end of the first 0.25 s?

A) 30 m/s
B) 60 m/s
C) 11 m/s
D) 120 m/s