physics
posted by Bethany .
A football is thrown upward at a(n) 37 angle
to the horizontal.
The acceleration of gravity is 9.8 m/s2 .
To throw a(n) 57.8 m pass, what must be
the initial speed of the ball?
Answer in units of m/s

physics 
bobpursley
Think on this. to go L meters horizontally, it has to be in the air T seconds.
in the horizontal
L=vi*cosTheta*t1/2 g t^2 where you solve for t in terms of the other unknowns (such as vi).
now in the vertical, the final position is the same as the initial position
vf=vi*sinTheta  g t
0=vi*sinThetag t put in the expression you found for t above, and solve for vi.
Respond to this Question
Similar Questions

physics
A football is thrown upward at a(n) 23◦ angleto the horizontal. The acceleration of gravity is 9.8 m/s To throw a(n) 52 m pass, what must be the initial speed of the ball? 
physics
A quarterback throws the football to a sta tionary receiver who is 26 m down the field. The football is thrown at an initial angle of 36.5 to the ground. The acceleration of gravity is 9.81 m/s2 . a) At what initial speed must the … 
physics
A quarterback throws the football to a stationary receiver who is 16 m down the ﬁeld.The football is thrown at an initial angle of38.5◦to the ground.The acceleration of gravity is 9.81 m/s2.a) At what initial speed must … 
AP Physics
A quarterback throws the football to a stationary receiver who is 15.2 m down the ﬁeld. The football is thrown at an initial angle of 42 ◦ to the ground. The acceleration of gravity is 9.81 m/s 2 . a) At what initial speed … 
AP PHYSICS
A quarterback throws the football to a stationary receiver who is 15.2 m down the ﬁeld. The football is thrown at an initial angle of 42◦ to the ground. The acceleration of gravity is 9.81 m/s 2 a) At what initial speed … 
PHYSICS
A quarterback throws the football to a stationary receiver who is 19.7 m down the ﬁeld. The football is thrown at an initial angle of 43◦ to the ground. The acceleration of gravity is 9.81 m/s^2. a) At what initial speed … 
Physics
A ball is thrown straight upward and returns to the thrower’s hand after 2 s in the air. A second ball is thrown at an angle of 38 degrees with the horizontal. At what speed must the second ball be thrown so that it reaches the … 
physics
A football is thrown upward at a 30 degree angle to the horizontal. To throw a 40.0m pass, what must be the initial speed of the ball? 
physics
A quarterback throws the football to a stationary receiver who is 22.7m down the field. the football is thrown at an initial angle of 39 degrees to the ground. The acceleration of gravity is 9.81m/s^2. a) at what initial speed must … 
Physics 1
A football is thrown upward at an 48◦ angle to the horizontal. The acceleration of gravity is 9.8 m/s^2. To throw an 80.4 m pass, what must be the initial speed of the ball?