Study the velocity vs. time graph shown. What is the displacement of the object from 2 seconds to
6 seconds?
Velocity vs. Time
O 4m
O 8 m
8
O 16 m
7
0 24 m
Velocity (m/s)
ONWA
0
1
2.
3
ch
6
Time (s)

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

The slope of a velocity time graph over any interval of time gives the during that interval

The ratio of lift to drag l/d for a wing or airfoil is an important aerodynamic parameter, indeed, it is a direct measure of the aerodynamic efficiency of the wing. if a wing is pitched through a range of angle of attack, l/d first increases, then goes through a maximum, and then decreases. consider an infinite wing with an naca 2412 airfoil. estimate the maximum value of l/d. assume that the reynolds number is 9x10^6.