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i threw a pebble 20m high in the air if it fell and settled at the bottom of the lake 12m deep.what is the distance the pebble fell?

Answer :

The distance it traveled from the ground=20m
the distance from there to back ground=20m
the distance from ground the bottom of the sea=12m
so,tot.distance=20+20+12=52
Avishek
The total distance travelled by the stone is :
The height reached (When the stone is rising) + The height reached (When the stone is coming down and reaches the land surface) + Depth of lake (When the stone reaches the bottom part of lake).

So, we get : 20 + 20 + 12
= 52m

Hope that helps !!

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