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A Physics Problem from Projectile Motion and Laws of Motion

A fish launches himself from a 6 cm cannon straight up in the sir. When he leaves the cannon he is traveling at 6.5 m/s. assume constant acc while in the cannon.
~What acceleration did the cannon apply to the fish?
~How long was he in the cannon?
~Once the fish is flying upwards, what is his acceleration?
~once he left the cannon, how high did he travel in the air?

The fish can hold his breath for 1.2 s out of water. Assuming that while in the cannon the fish is underwater  and once launched he is immediately in the air
~How long until he splashes back down into the water?
~What was the fish’s velocity  when he splashed back into the water?

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