As a certain object falls, its position s (in meters) above ground after t seconds is given by s(t)=20-5t^2. whats the average velocity of the object on the interval from t=1 to the time .5 seconds later? ? from t=1 to the time .1 seconds later?

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?

What type of electromagnetic wave is used in security pens? a. x-rays c. microwaves b. visible light d. ultraviolet radiation select the best answer from the choices provided

Which is not true about oxygen-17 and oxygen-18?