The moment of inertia of the ball is
The initial height of the ball is
The initial potential energy is
From the conservation of energy:
"gh=0.5v^2+0.5(0.4v^2)=0.7v^2"
"(9.81)(4.6\\sin{52.6\\degree})=0.7v^2"
"v=7.156\\frac{m}{s}"
"t=\\frac{2s}{v}=\\frac{2(4.6)}{7.156}=1.29\\ s"
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