Homework Help: Physics

Posted by George on Tuesday, October 5, 2010 at 2:53pm.

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?
To be honest I really don't know how to solve it. A step-by-step explantion would be helpful.

Physics - bobpursley, Tuesday, October 5, 2010 at 3:54pm
Horizontal:
7=viCos20*timeinair
timeinair=7/Vicos20

Vertical:
hf=hi+ViSin20*t-4.9t^2
put the timeinair expression in for time
0=0+ViSin20(7/cos20)-4.9(49/cos^2 20)

compute Vi

Answer this Question

Related Questions

physics - An Olympic long jumper leaves the ground at an angle of 23 degrees and...
physics - An athlete executing a long jumper leaves the ground at a 27.0 degree ...
Physics - A long jumper leaves the ground with an initial velocity of 12 m/s at ...
physics - A baseball is hit with a speed of 27 meters per second at an angle of...
physics - An athlete executing a long jumper leaves the ground at a 27.0 degree ...
math/ physics - An athlete executing a long jumper leaves the ground at a 27.0 ...
Physics - a long jumper jumps 10m and leaves the ground at an angle of 45 ...
physics - 1)A fire hose held near the ground shoots water at a speed of6.5 mps ...
physics - An athlete executing a long jumper leaves the ground at a 27.0 degree ...
physics - A child throws a ball with an initial speed of 8 m/s at an angle of 40...

For Further Reading

First Name:
School Subject:
Answer: