Question

1) A certain aircraft has a liftoff speed of 111 km/h.
(a) What minimum constant acceleration does the aircraft require if it is to be airborne after a takeoff run of 206 m?
(b) How long does it take the aircraft to become airborne?

2) A ball is thrown vertically upward with a speed of 36.0 m/s.
(a) How high does it rise?
(b) How long does it take to reach its highest point?
(c) How long does the ball take to hit the ground after it reaches its highest point?
(d) What is its velocity when it returns to the level from which it started?

Answer 1

a. Vf^2= 2*acceleration*distance....solve for a
b. vf=a*t solve for time t.
2.
a. final PE= initial KE
mgh=1/2 mv^2 or h=1/2 v^2/g