I believe 98 newtons.
Explanation (I'm a bit rusty): 1 cubic meter of water = 10,000 cubic centimeters, the density of water is 1g/cubic cm, so the water's mass is 10,000g, or 10 kg. Newtons (the SI unit of force) are expressed in kg*m/s^2, and gravity accelerates us at 9.8m/s. 10kg*9.8m/s^2=98 Newtons. Pretty sure that's right, learned it in physical science.
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