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(v^2)/(R)`

now if

`F_n = 0`

`mg = (mv^2)/(R)`

`v = √(Rg)`

`v = √(25 * 9.8)`

`v = 15.65 m/s`

so above will be the minimum speed