John see hua running towards him at 11m/s. while running, hua throws a ball to john at 5m/s. what is the speed of the ball as observed by john?

If the new moon happens on january 15th, what shape will it be on february 6th?

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?

Select the best definition for wavelength. the height of an oscillating electromagnetic wave the rate at which electromagnetic waves oscillate. the distance between two crests of an electromagnetic wave. the oscillations of electric and magnetic fields select the best definition for frequency. the oscillations of electric and magnetic fields. the height of an oscillating electromagnetic wave. the distance between two crests of an electromagnetic wave. the rate at which electromagnetic waves oscillate