physics
posted by emily .
A 20000 kg airplane takes off by traveling 300 m down a runway while the engines exert a continuous force of 4000 N.(a) Calculate the change in kinetic energy of the airplane during takeoff.(b) Determine the speed of the airplane as it leaves the runway.

Work in = change in Ke = force * distance
= 4000 * 300 = 12*10^5
so
(1/2)(2*10^5) v^2 = 12*10^5
v^2 = 12
v = 2 sqrt3
4,000 N is not enough to get this plane off the ground.
Respond to this Question
Similar Questions

College Physics
A 1200 kg airplane starts from rest and with a constant average forward acceleration of magbitude 5.0 m/s, reaches its takeoff speed in 9.00 s. The runway is 300 m long. What is the plane's takeoff speed? 
Physical science
A sustained force of 56 moves a model airplane 16 along its runway to provide the required speed for takeoff. Find the kinetic energy at takeoff. What is the formula? 
physics
To take off from the ground, an airplane must reach a sufficiently high speed. The velocity required for the takeoff, the takeoff velocity, depends on several factors, including the weight of the aircraft and the wind velocity. Part … 
Physics
A plane starts from rest at the end of a runway and requires 200.0 km/h for takeoff . If it takes 30.0 a to reach takeoff speed, what acceleration must the plane's engines provide to get off the runway ? 
PHYSICS
An airplane accelerates down a runway at 3.20 m/s 2 for 32.8 s until is finally lifts off the ground. Determine the distancetraveled before takeoff. 
Physics
A sustained force of 44 N moves a model airplane 10 m along its runway to provide the required speed for takeoff. Find the kinetic energy at takeoff. 
Physics
An airplane needs to accelerate at 4.7 m/s2 to reach takeoff speed before reaching the end of the runway. The mass of the airplane is 4500 kg. How much force is needed from the engines? 
physics
the takeoff speed for a large airplane is 180 mi/hr(roughly 80m/s0 the plane is capable of accelerating at a rate of 4m/s^2 assume that the plane starts at rest determine the minimum runway length required for this plane to safely … 
physics
the required takeoff speed for a large airplane is 180mi/hr(80m/s)the plane is capable of accelerating at a rate of 4m/s^2 assume the plane starts at rest, determine the minimum runway length required for this plane to safely take … 
physics
An airplane accelerates down a runway at 3.33 m/s2 for 35.3 s until is finally lifts off the ground. Determine the distance traveled before takeoff.