Carts A and B each have the same force applied to them. Cart A has half the mass of cart B. How does newtons first law of motion predict the result of accelerations of the cart?

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