“There is a metric ton of books in my backpack” is an example of

onomatopoeia
personification
hyperbole
simile
“My backpack stubbornly refuses all attempts to lift it, even when I use both hands” is an example of
onomatopoeia
personification
hyperbole
simile

chose one of the rspones to finish the sentence

The correct answer is hyperbole.

for both sentences

For the first sentence, the correct answer is hyperbole.

For the second sentence, the correct answer is personification.