*A ball is dropped from a window.* *the time that it takes to reach the ground is given by the formula t=**√2s/a* *where ***a** m/s^2 is the acceleration due to gravity and **s **m is the height of the window. *s=117m correct to 3 significant figures* *a= 9.8m/s^2 correct to 2 significant figures*

*Calculate the lower bound and the upper bound for the value of t.* *Give your answer correct to 4 decimal places.*

The answers are 4.8636 and 4.9094 but i dont get how to work it out, do you find the upper and lower bounds of each value then the formula ?? Help..... :(

Posted Wed 24th October, 2012 @ 22:56 by

Miss-know-it-all <3
s=117

u=0

v=

a=9.8

t=√(25/a)

s=ut+1/2(a)(t)^2

t=√(117/4.9)=2(117)/9.8=4.88646

Then calculate the U.B and L.B- I'm afraid I don't know how to do that part.

Answered Wed 7th November, 2012 @ 20:54 by

Former Member
**its okay i know how to do it now shall i explain it to you??**

Answered Wed 7th November, 2012 @ 21:28 by

Miss-know-it-all <3