Answer:
F= 224 N
Step-by-step explanation:
Given that
mass ,m = 80 kg
Radius ,r= 5 m
speed at the top v= 8 m/s
The force at the top = F
Now by using the Second law of Newton's

Now by putting the values

Take g = 10 m/s²

F= 224 N
Therefore the force exerted by the track at the top position will be 224 N.