Grigori
0

Given that

Radius of the chamber r = 25 m

Acceleration due to gravity g = 10 m/s^2

When the biker reaches the top of the death well, the centrifugal force acting on the motorcycle rider balances his weight as well as the normal reaction of the chamber's ceiling.

Centrifugal force F_c = \frac{mv^2}{r}

F_c=mg+N

Step 1: Calculating the minimum possible speed at the uppermost point

minimum possible speed at the uppermost point when normal force is zero

F_c = mg

\frac{mv^2}{r} = mg

v = \sqrt{rg}

v = \sqrt{25 * 10} = \sqrt{250}   

v = 15.8 m/s^2

Hence, minimum possible speed at the uppermost point v = 15.8 m/s^2