A. calculate the average speed (in km/h) of charlie, who runs to the store 4 kilometers away in 30 minutes. b. calculate the distance (in km) that charlie runs if he maintains this average speed for 1 hour

as per the question charlie runs to the store which is  4 km away

hence the total distance covered [S] is 4 km

he takes 30 minutes to reach the store.

hence the total time taken [t] = 30 minutes=0.5 hour

We have to calculate the average speed.

the average speed[v]=

                                   =

                                    =8 km/hour

then we have to calculate the total distance traveled by charlie in 1 hour.

the distance covered S=

                                      =8 km/hour ×1 hour

                                      =8 km

Hence the average speed of charlie is 8 km/hour and he covers a distance of 8 km in 1 hour.

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement