~attention babies, pls me~ ♥ ♥ ♥

a horse begins 10 meters along a road from an intersection. after 6 seconds it is 80 meters further west. what is the average velocity of the horse?

A10nc charge sits at a point in space where the magnitude of the electric field is 1500 n/c. what will the magnitude of the field be if the 10 nc charge is replaced by a 20 nc charge? assume the system is big enough to consider the charges as small test charges.