C
0.70
I hope this is help, I’m so so sorry if I’m incorrect
The formula will be AI2O3
I am pretty sure the answer is D. That the patterns of a polarity matched up on both sides.
KE=3070.625 J
Height = 3.686 m
<h3>Further explanation</h3>
mass of bike+rider=85 kg
velocity = 8.5 m/s
![\tt KE=\dfrac{1}{2}mv^2\\\\KE=\dfrac{1}{2}\times 85\times 8.5^2\\\\KE=3070.625~J](https://tex.z-dn.net/?f=%5Ctt%20KE%3D%5Cdfrac%7B1%7D%7B2%7Dmv%5E2%5C%5C%5C%5CKE%3D%5Cdfrac%7B1%7D%7B2%7D%5Ctimes%2085%5Ctimes%208.5%5E2%5C%5C%5C%5CKE%3D3070.625~J)
Conservation of energy :
(KE+PE)₁ (downhill) = (KE+PE)₂ (up the hill)
PE₁=0⇒h=0
KE₂=0⇒v=0(stop), so equation becomes :
KE₁=PE₂
![\tt KE_1=3070.625\\\\KE_1=mgh_2\\\\3070.625=85\times 9.8\times h\Rightarrow h=3.686~m](https://tex.z-dn.net/?f=%5Ctt%20KE_1%3D3070.625%5C%5C%5C%5CKE_1%3Dmgh_2%5C%5C%5C%5C3070.625%3D85%5Ctimes%209.8%5Ctimes%20h%5CRightarrow%20h%3D3.686~m)