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Physics
OpenStudy (anonymous):

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

8 years ago
OpenStudy (anonymous):

any clues? haha

8 years ago
OpenStudy (anonymous):

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

8 years ago
OpenStudy (anonymous):

is that b or c?

8 years ago
OpenStudy (anonymous):

1 is b 2 is c

8 years ago
OpenStudy (anonymous):

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

8 years ago
OpenStudy (anonymous):

isnt the square root of 92 squared 98?

8 years ago
OpenStudy (anonymous):

not sure what you mean

8 years ago
OpenStudy (anonymous):

for the first part of #1 you gave me

8 years ago
OpenStudy (anonymous):

calculate everything before you take the square root

8 years ago
OpenStudy (anonymous):

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

8 years ago
OpenStudy (anonymous):

i just noticed an error with #2

8 years ago
OpenStudy (anonymous):

iim not getting number 1 right i solved and got 87.6

8 years ago
OpenStudy (anonymous):

let me get a calc

8 years ago
OpenStudy (anonymous):

seems right to me

8 years ago
OpenStudy (anonymous):

geez i dont know what im doing wrong

8 years ago
OpenStudy (anonymous):

what did you get when you solved c?

8 years ago
OpenStudy (anonymous):

do you know how to do quadratic equations?

8 years ago
OpenStudy (anonymous):

yeah but i dont know how im getting c wrong

8 years ago
OpenStudy (anonymous):

can you tell me what you get

8 years ago
OpenStudy (anonymous):

i got about 1.06

8 years ago
OpenStudy (anonymous):

oh lol its in feet

8 years ago
OpenStudy (anonymous):

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

8 years ago
OpenStudy (anonymous):

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

8 years ago
OpenStudy (anonymous):

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

8 years ago
OpenStudy (anonymous):

i mean b

8 years ago
OpenStudy (anonymous):

okay

8 years ago
OpenStudy (anonymous):

and c?

8 years ago
OpenStudy (anonymous):

and c i got .9518 seconds after converting

8 years ago
OpenStudy (anonymous):

it didnt work neither did but thank you

8 years ago
OpenStudy (anonymous):

its those conversions

8 years ago
OpenStudy (anonymous):

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

8 years ago
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