Help Please with this Maths Question....

  • 0 votes

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 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

2 Answers

  • 0 votes

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 Alliesweet
  • 0 votes

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