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Sample Problem 2: The Cannon

A cannon is fired at a target 300 m away, at an angle of 45o. If the cannonball's initial height is equal to the height of the target, and there is no significant wind resistance, with what speed should the cannon be fired to hit the target?
step 1: read the question carefully
Re-read the question. The cannonball moves in two dimensions, with the only acceleration on the cannonball being gravity. This is the definition of projectile motion.

step 2: choose a coordinate system and draw a picture


click for step 2.

 


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Copyright 1999 Rensselaer Polytechnic Institute and DJ Wagner. All Rights Reserved.