A model rocket with the mass of 5kg has a downward thrust of 100 Newton’s. Assuming there are no other forces acting on the rocket what is the rockets acceleration upward

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