The position of a rocket sled on a straight track is given as x = a + be? + c, where a = 2.0 m/s", b = 2.0 m/s?, and c = 3.0 m.
a) What is the sled's position between t = 4.0 s and t = 9.0 s?
b) What is the average speed between t = 4.0 s and t = 9.0 s?

In which of the following cases is work being done on an object? question 2 options: pushing against a locked door carrying a box down a corridor pulling a trailer up a hill suspending a heavy weight with a strong chain

James is trying to prove newton's 2nd law of motion. he tries to move four different objects with different masses, shapes, and sizes from point a to point b. the objects are a toy car, a car, a refrigerator, and a kitchen table. after some experimentation, he finds that force is dependent on the mass of the object, rather than it's size or shape. the object that takes the most force to move is the

The experiment was repeated many years later but the gases were mixed in a different type of container. a white solid was obtained which was xenon fluoride. predict whether you think 1) krypton and 2) radon will react with fluorine. explain reasons for your predictions