A car is moving at 2 m/s when it accelerates at 4 m/s^2 for 2 seconds. His new velocity is?

What is the relationship between the wavelength of a wave and it's energy?

What is work? how much work is done to move an object 0 meters?

Two friends are having a conversation. anna says a satellite in orbit is in freefall because the satellite keeps falling toward earth. tom says a satellite in orbit is not in freefall because the acceleration due to gravity is not 9.80 m/2 . who do you agree with and why?