Question

tuti drops a marble into a 20 m deep well g=10 m/s^2. what is the time needed by the marble to reach the surface of water in the well?

Answer 1

u=0
s=20
a=10

use the same formula we used in the last question and find the value of t

Answer 2

I thought using the vt^2=2gh formula for this one, am i mistaken? physics is a bit confusing, and there are no proper information in my module

Answer 3

But you don't know the value of v, so u can't use this formula here.

Answer 4

Right... Thanks..

Answer 5

use \(\sf huge s=ut+\frac{1}{2}at^2\)
answer will be 4seconds

Answer 6

I got 5 seconds

Answer 7

20=0*t+0.5*10*\(\sf t^2\)
=>\(\sf t^2\)=4
=>t=2 seconds

Answer 8

Sorry answer will be 2 seconds

Answer 9

okay thanks