Math basic realted rates please help? ?

Question

A man observes the launching of a rocket from a distance of 300 feet. The rocket is launched at a speed of 100 ft/sec. How fast is the rocket moving away from the man four seconds after launch? How fast is the angle changing at this same moment?

I know it has to do with derivatives. Any help is greatly appreciated. Thanks

Answer 1

i dont know and i need help to

Answer 2

um well 100 ft/sec x 4 sec would be 400 feet right? but angle should still be 90 degrees

Answer 3

trick question?

is says it goes 100 ft/sec then it says how fast it's moving away. the speed of the angle changing is 100 ft/sec too.