Arifle is aimed horizontally at a target 55.0 m away. the bullet hits the target 3.00 cm below the aim point

what was the bullet's flight time?

what was the bullet's speed as it left the barrel?

Ascientist notices that an oil slick floating on water when viewed from above has many different colors reflecting off the surface, making it look rainbow-like (an effect known as iridescence). she aims a spectrometer at a particular spot and measures the wavelength to be 750 nm (in air). the index of refraction of water is 1.3