Mikael runs with a speed of 3 m/s for 45 seconds. How far does Mikael run?

Which type of electromagnetic waves are dangerous enough to be used to kill cancerous cells? (a)gamma rays (b)visible light (c)infrared light (d)microwaves

Aregion of space in which a measurable gravitational force is indicated by the force exerted on a test mass is called

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •