physics
posted by taylor .
an olympic long jumper i capable of jumping 8.0 m. Assuming hi horizonal speed is 9.1 m/s as he leaves the ground, how long is he in the air and how high doe he go? Assume that he lands standing upright that is, the same way he left the ground.

d = V*t,
t = d/V = 8 m / 9.1 m/s = 0.879 s.
Tr + Tf = 0.879 s,
Tr = Tf,
Tr + Tr = 0.879,
2Tr = 0.879,
Tr = 0.4395 s. = Rise time or time to reach max height.
Vf = Vo + gt.
Vo = Vf  gt,
Vo = 0  (9.8)(0.4395) = 4.307 m/s.
h = Vo*t + 0.5g*t^2,
h = 4.307*0.4395  4.9*(0.4395)^2 = 0.946 m.
Respond to this Question
Similar Questions

physics
An Olympic long jumper leaves the ground at an angle of 23 degrees and travels through the air for a horizontal distance of 8.7 meters before landing. What is the takeoff speed of the jumper? 
Physics
a long jumper jumps 10m and leaves the ground at an angle of 45 degrees.determine the speed he leaves the the ground at, 
Physics
A long jumper leaves the ground at an angle of 20 degrees and travels a horizontal distanceof 7.0m before landing. What is the takeoff speed of the jumper? 
Physics
An Olympic long jumper is capable of jumping 8.3 m. Assume that his horizontal speed is 9.5 m/s as he leaves the ground. He was in the air for .87 seconds. How high does he go assuming that he lands upright, the same way he was when … 
physics
A baseball is hit with a speed of 27 meters per second at an angle of 45 degrees. It lands on the flat roof of a 13 meter tall building. If the ball was hit when it was 1 meter above the ground, what horizontal distance does it travel … 
physics
I do not understand the answer that was given to me on a post dated Nov. 23. Please help explain my questions that appear at the end of this post. Bart  Posted by Bart on Wednesday, November 23, 2011 at 6:52am. A … 
Physics
A long jumper leaves the ground with an initial velocity of 12 m/s at an angle of 28degrees above the horizontal. Determine the time of flight, the horizontal distance, and the peak height of the longjumper. 
physics
An Olympic long jumper leaves the ground at an angle of 18.7 ° and travels through the air for a horizontal distance of 7.04 m before landing. What is the takeoff speed of the jumper? 
PhysicsHELP
An Olympic long jumper is capable of jumping 7.5 m. Assume that his horizontal speed is 8.8 m/s as he leaves the ground. How long is he in the air? 
Physics
An Olympic long jumper is capable of jumping 8.44m. Assuming his horizontal speed is 5.644m/s as he leaves the ground, how high does he go?