A boy run 5 km due west and then return back to travel a further distance of 4km before resting. the whole journey takes 1 hour calcute His total distance travelled
His average speed
his displacement from the starting point
his average velocity

the answer for apex is the lowest

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.