physics
posted by Andy .
A Hollywood Daredevil plans to jump a canyon on a motorcycle. There is a 15 m drop and the horizontal distance originally planned was 60 m but it turns out the canyon is really 69.6 m across. If he desires a a 3.2 second flight time
a. what is the correct angle of his launch ramp?
b.what is his correct launch speed?
c.what is the correct angle for the landing ramp?
d.what is his predicted landing velocity?

physics 
drwls
I answered this question last night. Have you changed screen names? The 60 m "original" information is irrelevant

physics 
Andy
yes, same person I just don't understand why im getting this problem wrong for a. predict the launch angle. I do tan inverse of 7.87/21.75 giving an angle of 19.9 degrees so I tried subtracting from 180 degrees but im not getting it right either way can you explain please?

physics 
bobpursley
consider the horizontal
69.6=speed*cosTheta*3.2
consider the vertical
15=speed*sinTheta*3.2 4.9 3.2^2
solve each side for speed first.
speed= 69.6/(3.2cosTheta)
speed= (15+4.9*3.2^2)/sintheta*3.2
set them equal
69.6/(3.2cosTheta)=(15+4.9*3.2^2)/sintheta*3.2
multipy both sides by sinTeta
69.6/3.2 * tanTheta= (15/3.2 + 4.9*3.2)
solve for Theta.
tan theta= (4.68+15.68)/21.75=.505
I get 26 deg. Check my work and thinking carefully. Very carefully. 
physics 
Andy
ok thanks very much I understand the upward motion part of the problem. I am still have trouble with the downward motion can someone explain. Thanks for the help
Respond to this Question
Similar Questions

physics
A Hollywood Daredevil plans to jump a canyon on a motorcycle. There is a 15 m drop and the horizontal distance originally planned was 60 m but it turns out the canyon is really 69.6 m across. If he desires a a 3.2 second flight time … 
physics
A Hollywood Daredevil plans to jump a canyon on a motorcycle. There is a 15 m drop and the horizontal distance originally planned was 60 m but it turns out the canyon is really 69.6 m across. If he desires a a 3.2 second flight time … 
Physics
A Hollywood daredevil plans to jump the canyon shown in the figure on a motorcycle. There is a 15. m drop and the horizontal distance originally planned was 60. m but it turns out the canyon is really 65.7 m across. If he desires a … 
Physics
A daredevil decides to jump a canyon of width 10 m. To do so, he drives a motorcycle up an incline sloped at an angle of 15 degrees. What minimum speed must he have in order to clear the canyon? 
Physics
A daredevil decides to jump a canyon of width 10 m. To do so, he drives a motorcycle up an incline sloped at an angle of 15 degrees. What minimum speed must he have in order to clear the canyon? 
Physics
A daredevil decides to jump across a 15 m wide canyon on his motorcycle. The opposite side of the canyon is 3 m lower than the side the daredevil starts on. The daredevil drives his motorcycle off the cliff at a speed of 27 m/s. How … 
Physics
A Hollywood daredevil plans to jump the canyon shown in the figure on a motorcycle. There is a 15. m drop and the horizontal distance originally planned was 60. m but it turns out the canyon is really 65.7 m across. If he desires a … 
Physics
A daredevil decides to jump a canyon of width 6.5 m. To do so, he drives a motorcycle up an incline sloped at an angle of 9.45◦. The acceleration of gravity is 9.8 m/s2 . What minimum speed must he have in or der to clear the … 
physics
A daredevil decides to jump a canyon of width 12 m. To do so, he drives a motorcycle up an incline sloped at an angle of 14.2◦. The acceleration of gravity is 9.8 m/s2 . What minimum speed must he have in order to clear the canyon? 
Physics
A daredevil decides to jump a canyon of width 4.22 m. To do so, he drives a motorcycle up an incline sloped at an angle of 12.4◦. The acceleration of gravity is 9.8 m/s. What minimum speed must he have in order to clear the canyon?