Which represents the upward force perpendicular to the floor

it is

a

asked for and recieved from the united states

small european communities with shared traditions consolidated into large new states (apex)

ww1 weapons: tank. tanks were used for the first time in the first world war at the battle of the somme. they were developed to cope with the conditions on the western front. the first tank was called 'little willie' and needed a crew of 3.