2(a)Name two artificial satellites. (b) A geostationary satellite moves in an orbit of radius 6300 km. Calculate the speed with which it moves in the orbit. [n = 22/7]. 3. A projectile is fired at an angle 30° to the horizontal with a velocity of 40 ms-1. Calculate the velocity attained after 1s. [g= 10 ms-2]. The circuit diagram below is a sim- ple current rectifier circuit. Use it to answer the questions that follow.​