A physics student launches a model rocket from the ground at t=0. The rocket ascends with a constant vertical acceleration of a1= 2.5m/s^2 until T1= 5.0s, when the acceleration increases to a2= 5.0m/s^2 until T2= 10.0s. When t>T2, the engine shuts down entirely.
(b) What is the velocity of the rocket when it hits the ground?
The Attempt at a Solution
but the answer is -66.8 m/s
what am i doing wrong?
Thanks for your help!