A projectile is fired with an initial speed of 100 m/s and angle of elevation 30 degrees. The projectile eventually hits the ground. How far from the initial position (which can be assumed to be the origin) does it travel? Find the speed at impact (with the ground). Note that the projectile is sibject to the downward acceleration due to gravity of 9.8meters per sq. sec

Engines for propeller-driven aircraft are limited in their maximum rotational speed by the fact that the tip speed of the propeller must not approach the speed of sound in air (mach i). taking 6 ft as a typical diameter for a propeller of a light airplane and 1100 fils as the speed of sound, find the upper limit on the rpm (revolutions per minute) of the propeller shaft.