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anonymous
 4 years ago
A cannon is situated on the edge of a cliff that is 78m above the sea. A ball that is dropped straight down will hit the sea with a speed of 39m/s. if the cannon fires a shell horizontally at 260m/s, calculate the time for the shell to hit the water.
anonymous
 4 years ago
A cannon is situated on the edge of a cliff that is 78m above the sea. A ball that is dropped straight down will hit the sea with a speed of 39m/s. if the cannon fires a shell horizontally at 260m/s, calculate the time for the shell to hit the water.

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Let me give you the idea for this question.Whether the ball is fired horizontally or dropped the final velocity(In this case 39m/s) will be the same.Initial velocity is 0.So go for s=ut+.5at^2.Substitute in this equation the values and get the answer

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0To find 'a'(acceleration) you can use v^2u^2=2as

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0change in d = v1(time) +1/2(acceleration)(time)^2 < that equation? and alright. Thanks :)

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0yes that equation well notataions are different in different books.....
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