Question

I need help with this question please?

Answer 1

`t=100 \left(1-(V)/(50) \right)^2\\\\(t)/(100)=\left(1-(V)/(50) \right)^2`

Since time is positive, we take the positive square root.

`(√(t))/(10)=1-(V)/(50)\\\\(√(t))/(10)-1=-(V)/(50)\\\\50-5√(t)=V\\\\\therefore f^(-1)(V)=\boxed{50-5√(V)}`