Hydraulics- rectangular open channel characteristics NEED HELP PLEASE

Question

Water flowing through a rectangular channel experiences a hydraulic jump. The initial depth is

0.43m and the flow per unit width is 5.3 m2/s. Compute:

1. The sequent depth

my un-checked answer Ys=3.4 m

2. The head loss through the jump

my un-checked answer HL=1.53m

3. The specific force downstream of the jump (γ = 9790 kg m-2 s-2, ρ = 998 kg m-3)

my un-checked answer SF= 59981.6

4. The critical depth of the channel

need help answering

5. The minimum specific energy

need help answering

Answer 1

I'll refer to question 4 and 5.

The equation for critical state of flow is:

v²/(2g)=y_c/2

Equation for froude number is:

Fr= v/sqrt(gy)

You'll be able to answer both those questions if you're able to find the relationship between Fr and y_c