It's the difference between the cooling rates of water and the pool. You can find a complete answer here:
a pool
Atcually it was Emily in the pool cause she is a swimmer and Ian did.
about 10
Upthrust
Swimming in a shallow pool can be more challenging because there is less water to work with, making it easier to hit the bottom or sides. a deep pool can provide more space to swim without those obstacles.
it depends how fast the swimmer is
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The cast of Pool Shark - 2003 includes: Reuben Armstrong as Audience Peter Barns as Audience Midge Barns as Audience June Bumford as Swimmer Lea Caton as Swimmer Colin Coulter as Swimmer Sandie Cusack as Audience Katherine Cusack as Audience Ivy Edwards as Swimmer Emily Gostlin as Swimmer Marion Guy as Swimmer Andrew Hocking as Life Guard Emilie Labussiere as Audience Mill Lusk as Swimmer Adele Proctor as Swimmer Connor Ramsey as Swimmer
The most common way is to stand 3/4 from the front of the block and wait for the swimmer to come. When the swimmer gets to the "T" at the end of the pool the swimmer on the block dives in over the swimmer in the water.
There's two parts to this: 1) Only "jump in" a pool that is approved for diving, and only where it's deep enough that you won't be injured (by hitting the pool bottom or side). 2) If there's a shallow end, there no reason a non-swimmer couldn't wade into the pool under supervision (by a swimmer who can rescue them if they get into trouble). I wouldn't recommend a non-swimmer "jump in" the deep end of a pool even with supervision.
A pool and a stop watch.
when her parents dropped her in a pool and she floated