A particle moves along a straight line such that its position is defined by s = (t^3- 3t^2 2) m. Determine the average velocity, the average speed, and the acceleration of the particle when t = 4 s.

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length

the electric field is a “force field” around a charged object that illustrates the direction the electric force would push an imaginary 

kepler used the data from tycho blahe (his mentor) to construct the laws of planetary motion.