Question

A ball is dropped from a height of 1.50m and rebounds to a height of 1.15m .
Part A
Approximately how many rebounds will the ball make before losing 93% of its energy?
Express your answer as an integer.

Answer 1

@ganeshie8 I got 4 and then i got 11 but there both wrong

Answer 2

try 10

Answer 3

yess it was ten

Answer 4

how did u get ten bc i got 11

Answer 5

how much % energy its losing when it hits the ground 1 time ?

Answer 6

(1.15/1.5)*100 = 23.33 %

Answer 7

so, we need to solve below thing :-

(1-.233)^x = (1-.93)

Answer 8

http://www.wolframalpha.com/input/?i=%281-.233%29%5Ex+%3D+%281-.93%29

Answer 9

ohh I didnt do it that way

Answer 10

how would you know how to solve this kind of problem?

Answer 11

how u did ?

Answer 12

may be it becomes clear to u, if u tell me how u did,
and i spot the mistake... if any :)

Answer 13

I did this 100-93=7% , then took 7% x 1.5= .105 this means that it has energy or something at 93% then 1.15/ 1/5 = .76666 so i just multiplied the 1st bounce then 2nd bounce and 3r bounce and kept on going until i got to 11 but i could be wrong bc it probably made a difference in sig figs

Answer 14

I kept on multiplying by that number until I got to .105 and then counted how many bounces there were

Answer 15

omg are we suppose to count the 1st drop at a bounce bc i did that and i dont think i was suppose to, ahhhh lol thank you so much

Answer 16

good logic :)

Answer 17

u shud have stopped at 10th bounce... thats all

Answer 18

thank you so much =D