Ayoungster throws a rock from a bridge into the river 50 m below. the rock has a speed of 15 m/s when it leaves the youngster’s hand. calculate the velocity of the rock when it strikes the water if it is thrown upward.

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.

Which of the following is another term for a planned economy

What is the relationship between wavelength of light and the quantity of energy per photon?