If Maria lifts a mass of 10 kg onto a table 1.25 m high. How much G. P.E. (Gravitational potential energy) has the mass gained?

In positive numbers less than 1, the zeros between the decimal point and non zero are significant

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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.