Ahorse trots away from its trainer in a straight line .moving 38 m away in 9.0 s . it then turns abruptly and gallops halfway back in 1.8 s . calculate its average speed and average velocity?

Students in an introductory physics lab are performing an experiment with a parallel-plate capacitor made of two circular aluminum plates, each 11 cm in diameter, separated by 1.0 cm. how much charge can be added to each of the plates before a spark jumps between the two plates? for such flat electrodes, assume that value of 3×106n/c of the field causes a spark.