A roller coaster is released from the top of a track that is 57 m high. Find the roller coaster speed when it reaches ground level.

Amplitude is a measure of a waves a; speed b; distance c; energy d; frequency

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.

What is the rate of change in a objects position?