04 13
Two diving platforms 10 m high terminate just at the edge of each end of a swimming pool 30 m long. How fast?
Swimming & Diving Zostaw komentarz asked:
Two diving platforms 10 m high terminate just at the edge of each end of a swimming pool 30 m long. How fast must two clowns run straight on their respective platforms if they are to collide midpool, at the surface of the water?
Podobne:
- How do I do diving in the swimming pool? rockylad_75 asked: How do I do diving correctly as in...
- How do I stop my dogs from drinking swimming pool water? iheartbassets3 asked: My three basset hounds keep drinking water out...
- Can anyone make water spiral threw an automatic swimming pool cleaner’s pipes? pooltornado.com asked: My question is can you make the water...
Komentarze (2) do “Two diving platforms 10 m high terminate just at the edge of each end of a swimming pool 30 m long. How fast?”
Zostaw komentarz
Zaloguj się, by móc komentować.
15 kwietnia 2011 o 14:47
think of x and y motion separate. first, find how much time it would take for a clown to fall the 10 meters to the water. use this equation- distance= (1/2)at^2. now, each clown would have to fall 15 meters in the x direction to meet in the middle. since during freefall x velocity remains the same, simply divide the distance traveled by time and you have velocity.
i figured about 1.43 sec for time,
and about 10.5 m/s for velocity
19 kwietnia 2011 o 1:42
They will collide when Vx t = X and Vx t = L - X so that 2Vx t = L and Vx = L/2t; where L = 30 m. Vx = ? the speed you’re looking for. t is the time in the air for both clowns; it equals t = sqrt(2H/g); where H = 10 m and g = 9.81 m/sec^2.
Solve for Vx = L/(2 sqrt(2H/g)) = 30/(2*sqrt(2*10/9.81)) = 10.5 mps ~ 24 mph. ANS.