Question

Rupert (66 kg) is now in a full-pipe of radius 25 m, calculate the minimum speed at which Rupert can skate to ensure he will not a fall off the skateboard at the top of the pipe?
**SHOW WORK**

Answer 1

at the top most point if Rupert will not fall then normal force at the top point is almost zero for minimum speed

so here we can say

$F_n + mg = m\frac{v^2}{R}$

now if

$F_n = 0$

$mg = \frac{mv^2}{R}$

$v = \sqrt{Rg}$

$v = \sqrt{25 \times 9.8}$

$v = 15.65 m/s$

so above will be the minimum speed