求解英文物理題（關(guān)于運動學(xué)）
A model rocket is launched straight upward
with an initial speed of 51.9 m/s.It acceler-
ates with a constant upward acceleration of
1.58 m/s2
until its engines stop at an altitude
of 150 m.
1.What is the maximum height reached by
the rocket?The acceleration of gravity is
9.81 m/s2.
Answer in units of m.
2.When does the rocket reach maximumheight?
Answer in units of s.
3.How long is the rocket in the air?
Answer in units of s.