The Mofo DAm holds back a depth of 70 ft of water, but the lake behind the dam is 100 ft wide. The Fus-Ro-Dah Dam holds back a depth of 70 ft of water, but the lake behind
the dam is 2 miles wide.
If the dams are to be constructed in the same way, which dam had to be constructed to
be strongest? The water levels do not vary seasonally.

Initial velocity,  u = 4.9 m/sfinal velocity = v m/sinitial height,  h₁ =  245 m    final height, h₂ = 0a = -9.8  m/s²time taken = t secondss = ut + 0.5at²⇒  (h₂-h₁) = ut + 0.5at²⇒  0-245 = 4.9t + 0.5×(-9.8)×t²⇒ -245 = 4.9t - 4.9t²⇒ 4.9t² -4.9t -245 =0solving it, we get   t = 7.59sv  = u +  at = 4.9 -9.8×7.59 = 4.9 - 74.38 = -69.48 m/svelocity is  69.48 m/s downward

Ibelieve the answer is either b or c, but i'm leaning more towards c.hope my answer has you : )

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