Question

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

Answer 1

any clues? haha

Answer 2

Vfinal^2 = Vinitial^2 + 2aX

1.
sqrt((98^2) + 2(-9.81)98)
2.
sqrt(-(98^2) + 2(-9.81)98)

Answer 3

is that b or c?

Answer 4

1 is b 2 is c

Answer 5

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

Answer 6

isnt the square root of 92 squared 98?

Answer 7

not sure what you mean

Answer 8

for the first part of #1 you gave me

Answer 9

calculate everything before you take the square root

Answer 10

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

Answer 11

i just noticed an error with #2

Answer 12

iim not getting number 1 right i solved and got 87.6

Answer 13

let me get a calc

Answer 14

seems right to me

Answer 15

geez i dont know what im doing wrong

Answer 16

what did you get when you solved c?

Answer 17

do you know how to do quadratic equations?

Answer 18

yeah but i dont know how im getting c wrong

Answer 19

can you tell me what you get

Answer 20

i got about 1.06

Answer 21

oh lol its in feet

Answer 22

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

Answer 23

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

Answer 24

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

Answer 25

i mean b

Answer 26

okay

Answer 27

and c?

Answer 28

and c i got .9518 seconds after converting

Answer 29

it didnt work neither did but thank you

Answer 30

its those conversions

Answer 31

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