Question

Free Falling Body.

Answer 1

A free falling body travelled 60m during the last second before it hits the ground. If it was released from rest, find: the altitude the body was released?

Answer 2

and the time the body remain in air

Answer 3

How do you think you can solve this? its a standard problem actually!

Answer 4

im sorry

Answer 5

why are you sorry? :-/
m just asking.. do you have any idea? :)

Answer 6

i have no idea.. i tried but i got 60m.. so wrong

Answer 7

Ok.. so lets say the body is dropped from an altitude of h and takes time T to fall.
now can u tell me how would we calculate the distance travelled in the Tth second?

Answer 8

s= 1/2 gt^2

Answer 9

no

that is wrong.. you see.. that is the total distance travelled in T seconds..

i want the distance travelled in Tth second..

for example.. if i wanted to find out what is the distance travelled in say, 5th second..
i don't want distance in total 5 seconds.. i want only in that 5th second.. (meaning from 5 to 6 seconds).. get it?! so its an interval of 1 second. beginning at 5 and ending at 6s

Answer 10

im still confused...

Answer 11

you didn't understand my example?!

Answer 12

if you didn't .. tell me.. i ll give another example.. which i ll bet u ll understand!!

Answer 13

yes.. pls

Answer 14

Ok consider this data

a car is travelling for 3 hours.. let say it starts at time t=0
at t = 1 hr it has travelled 10m
t = 2 hr it has travelled 50m
and t = 3 hr it has travelled 70 m
now.. my question is, what is the distance travelled by the car in the 2nd hour (not in 2 hours.. but during the 2nd hour)

Answer 15

i guess its 40..

Answer 16

thats correct.. but do you mind telling me.. what went in your head? to give me that answer? hw did you get that number, and how and why!?

Answer 17

its during.. the interval between the first hour and the second..

Answer 18

exactly.. now instead hours.. we can have the same concept for seconds..

so imagine.. i told you.. a ball is in free fall for 10 seconds.. what is the distance travelled in 10th second.. how would you calculate that?

Answer 19

its 1?

Answer 20

NOOO.. i am just asking how would you calculate it?!? the distance for the 10th second/? just like what you did before

you would find the total distance travelled in 10 seconds, then find the distance travelled in 9 seconds.. and subtract

thats what you did for the example i gave right???

Answer 21

yes..

Answer 22

so in general if you want to calculate the distance travelled in Tth second.. what distances you should calculate and subtract?

Answer 23

the distance during the last seond and the distance when the object hits the ground

Answer 24

tell me in terms of T

For 5th second.. its distance travelled in 5 seconds - distance in 4 seconds

similarly for Tth second?

Answer 25

T1-T0..

Answer 26

tehre is no T1 and T0

answer in terms of T.. Tth second.. !!!!

Answer 27

i dont get Tth second. I just don't get everything. i just wanna try to figure out why aren't using the formula.. s=1/2gt^2..

Answer 28

cause that gives you TOTALLLLL DISTANCE in t seconds..
you want the distance travelled in Tth second... ( in that interval of 1 second)