an arrow is fired straight up into the air from ground level. after t seconds its altitude is s(t)=-16t^2+100t where s(t) is given in feet: after how many seconds will the arrow be 100 feet above ground

Question

solomonzelman · Answer

above the ground, or below the ground ?

solomonzelman · Answer

it begins (going up) above the ground, and if you say "will" - it will be BELOW the ground (not above it).

solomonzelman · Answer

are you sure you didn't allow any typos in your post ? maybe you have a correction to make?

anonymous · Answer

no thats what the question says.

solomonzelman · Answer

well it is above the ground right after t=0

solomonzelman · Answer

it will be above the ground as somewhere after 6, -16t^2 exceeds the 100t in absolute value.

solomonzelman · Answer

I can't help it if the question is wrong.

solomonzelman · Answer

here is the graph, so that you can see. Just went on desmos.com to do it. https://www.desmos.com/calculator/xgtovnks83

anonymous · Answer

okay thank you for tryimg

solomonzelman · Answer

you can see that after t=6.25 it will be below the ground

solomonzelman · Answer

bye, and good luck-:(

anonymous · Answer

yes i see thank you Ill ask my teacher about it

solomonzelman · Answer

alrighty then... see you!