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You have to add the fores in the air and the water Air: a=9.8 m/s^2 due to gravity Force=ma, F=62(9.8)=607.6 Water: First find the velocity in which the diver enters the water, V^2=V0^2 + 2ay V^2= 0 + 2(9.8)(10) V= sqr(20*9.8)= 14m/s Now use velocity to