physics
posted by Sally .
Limo kicks a ball vertically upwards from 1m above the ground at 18m/s. It rises to its highest point and then falls down, just getting caught on a branch 5.5m above the ground. (ignore any sideways movement) How long is the ball in flight?

physics 
Henry
Tr = (VfVo)/g.
Tr = (018) / 9.8 = 1.84 s. = Time to rise to max ht.
hmax = ho + (Vf^2Vo^2)/2g.
hmax = 1 + (0(18)^2) / 19.6 = 17.5 m.
above gnd.
d = Vo*t + 0.5g*t^2 = 17.55.5.
18t + 4.9t^2 = 12.0.
4.9t^2 + 18t  12 = 0.
Use Quadratic Formula:
Tf = 0.576 s. = Time to fall to 5.5 m.
Tr + Tf = 1.84 + 0.576 = 2.42 s. = Time
in flight.
Respond to this Question
Similar Questions

physics
An outfielder throws a baseball from the outfield to the third baseman. In flight, the ball reaches a height of 25 ft above the ground. The outfielder releases the ball from a height of 6 ft above the ground with a speed of 124 ft/sec. … 
math
A woman throws a cricket ball upwards into the air. The ball leaves the womans hand at 1.8m above the ground at speed of 9.7. It rises and then falls back to the ground. Considering the energies involved calculate the speed at the … 
Physics
A ball is thrown upwards from the ground with a velocity of 30m/s. How long will it take to reach a point 10.0m above the ground on its way down? 
Physics
A ball is thrown from a point 1.0 m above the ground. The initial velocity is 19.6 m/s at an angle of 30 degrees above the horizontal. Find the maximum height of the ball above the ground. Calculate the speed of the ball at the highest … 
Physics
A model rocket has a mass of 3.00 kg. It is fired so that when it is 220 m above the ground it is travelling vertically upward at 165 m/s. At that point its fuel runs out so that the rest of its flight is without power. Assume that … 
physics
a ball bounces three times before it is caught. it initially falls 5 m, then rises back up to 4m, then falls 4m, rises back up to 3m, then falls 1.5m where it is caught. what is the balls displacement from its original position 5m … 
Physics
A soccer player kicks a 0.43 kg ball straight up to see how far it will rise. The ball starts with a velocity of 16m/s at a height of 0.85m above the ground. It rises then falls straight down to the ground. a) what is the total energy … 
Maths
A ball is thrown vertically upwards at 3 m s1 from 1m above ground level (I) write down the equation for the height of the ball above the ground after t seconds (while the ball is in the air). (II) use your answer to find the time … 
Maths
A ball is thrown vertically upwards at 3 m s1 from 1m above ground level (I) write down the equation for the height of the ball above the ground after t seconds (while the ball is in the air). (II) use your answer to find the time … 
physics
A ball thrown vertically from ground level is caught 3s later when it is at its highest point by a person on a balcony which is 14 m above the ground. Determine the initial speed of the ball