First slide
Release from certain height

A stone is dropped from the top of a tower of height h. After 1 s another stone is dropped from the balcony 20 m below the top. Both reach the bottom simultaneously.  What is the value of h ? Take g = 10 ms-2.


h=12gt2 and h20=12g(t1)2 
Solving them, we get t = 2.5 s and h = 31.25 m.

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