On May 20 1999 Robbie Knievel easily cleared a narrow part o

On May 20, 1999, Robbie Knievel easily cleared a narrow part of the Grand Canyon during a world-record-setting long-distance motorcycle jump-69.5 m. He left the jump ramp at a 10 degree angle above the horizontal. How fast was he traveling when he left the ramp Indicate any assumptions you made.

Solution

the expression for the horizontal range is,

R = u²sin2@/g

69.5 = u²*sin(2*10^o) /9.8

hence, the velocity is,

u = 44.63 m/s