A piece of chalk is tossed vertically upward by Prof. Schwarzenegger and hits the ceiling 98 feet above with a BANG. (Neglect the effects of air resistance. Round your answers to two decimal places.) (b) Assuming that Prof. Schwarzenegger in fact tossed the piece of chalk up at 98 ft/s, how fast was it moving when it struck the ceiling? ft/s (c) Assuming that Prof. Schwarzenegger tossed the chalk up at 98 ft/s, and that it recoils from the ceiling with the same speed it had at the instant it hit, how long will it take the chalk to make the return journey and hit the ground? @Mathem

any clues? haha

Vfinal^2 = Vinitial^2 + 2aX 1. sqrt((98^2) + 2(-9.81)98) 2. sqrt(-(98^2) + 2(-9.81)98)

is that b or c?

1 is b 2 is c

that formula that i gave you, has your teacher taught you that?

isnt the square root of 92 squared 98?

not sure what you mean

for the first part of #1 you gave me

calculate everything before you take the square root

ive set it equal to V final, so i took the square root to cancel the square

i just noticed an error with #2

iim not getting number 1 right i solved and got 87.6

let me get a calc

seems right to me

geez i dont know what im doing wrong

what did you get when you solved c?

do you know how to do quadratic equations?

yeah but i dont know how im getting c wrong

can you tell me what you get

i got about 1.06

oh lol its in feet

this has to be converted to meters in order to use most physics formulas

can you tell me b and c quick? im sorry to rush gotta go soon

well a doesnt need to be converted to meters a second, so its 87.6

i mean b

okay

and c?

and c i got .9518 seconds after converting

it didnt work neither did but thank you

its those conversions

Do you have the answers, are you trying to know how to do it?

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