Question 891520
At time {{{t=0}}}, the rider is at the minimum.
At time {{{t=1}}}, the rider is at the maximum. 
If the rider was at 0m elevation, then the position would look like,
{{{Y=((50.5)/2)sin(((2pi)/2)*t)}}}
{{{Y=25.25sin(pi*t)}}}
So now just add the 2.5m to the equation,
{{{highlight_green(Y[act]=2.5+25.25sin(pi*t))}}}
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No, there is no way to get around {{{pi}}}(Mmmmm {{{pi}}}) since it's used to calculate the period of your sine function.