The cannon on a pirate ships shoots cannon balls with a speed of 350m/s (the muzzle velocity). the cannon can be adjusted to shoot at any elevation above the horizontal. verified track access graded assessments are available to verified track learners. upgrade to unlock ($49) the world’s tallest building is the burj khalifa which stands at 828m above the ground. verified track access graded assessments are available to verified track learners. upgrade to unlock ($49) when you hit a 0.27kg volleyball the contact time is 50ms and the average force is 125n . verified track access graded assessments are available to verified track learners. upgrade to unlock ($49) two equivalent masses are attached by a rope that hangs over a pulley. since the coefficient of friction is less than 1, they accelerate to the right and down.