# physics

posted by .

A player kicks the football from the ground with a velocity of of 30m/s at 45 degree angle. The time take to reach maximum height was 0.7 s. Find the maximum height and describe your work.

• physics -

vf=Vivertical-gt
but vf in the vertical is zero at the top, so
0=Vi*sin45-9.8t
solve ford Vi

Height= vivertical*t-1/2 g t^2
= Vi*sin45*t-1/2 g t^2

## Similar Questions

1. ### Physics

A player kicks a football from ground level with a velocity of magnitude 31.0 m/s at an angle of 30.0 degrees above the horizontal. What is its maximum height?
2. ### Math

Rita kicks a football. Its height h, in metres, after t seconds is given by h = —4.9t^2 + 22.54t + 1.1. To one decimal place, find the maximum height of the football and the time when it reached this height.
3. ### Physics

A football player kicks a football with an initial velocity of 30m/s at an angle of 55 degrees relative to the flat ground. a)what is the speed of the football at its highest point b)find the highes point reached c)find the total time …
4. ### physics

player kicks football from ground level with velocity of32 m/s at an angle of 40 degrees above horizontal. What is hang time of football?
5. ### Physics

A player kicks the football from the ground with a velocity of of 30m/s at 45 degree angle. Find the initial vertical velocity?
6. ### Physics.

A punter kicks a football at an angle of 45 degrees to the ground. The football has an initial velocity of 25 m/s, make a diagram and calculate: a) How long was the football in the air?
7. ### physics

a projectile is thrown from the ground with an initial velocity of 20.0 m/s at an angle of 40.0 degrees above the horizontal. find the projectile's maximum height, the time required to reach its maximum height, its velocity at the …
8. ### physics

a projectile is thrown from the ground with an initial velocity of 20.0m/s at an angle of 40 degrees above the horizontal, find the maximum height,the time required to reach its maximum height,c) it velocity at the top of the trajectory.d) …
9. ### Math

a punter kicked the football into the air with an upward velocity of 62 ft/s. its height in feet after t seconds is given by the function h = -16t^2 + 62t +2. What is the maximum height the ball reaches?
10. ### Pre-Cal

A baseball player throws baseball at a velocity 139ft per second at an angle of 20 degrees. The ball leaves the players hand at a height of 5 feet. The path of the ball has a parametric equation x=v(o)t cos(o) and y-h+v(o)tsin(o)-16t^2. …

More Similar Questions