A student fires a cannonball horizontally with a speed of 38.0m/s from the top of a building. The cannonball remains in the air for 2.70s. Neglect drag.
From what height was the cannonball launched?
How far from from the base of the building will the ball land (measured along the
ground)?

What is a good example of instantaneous speed

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Aleaky 10-kg bucket is lifted from the ground to a height of 15 m at a constant speed with a rope that weighs 0.7 kg/m. initially the bucket contains 45 kg of water, but the water leaks at a constant rate and finishes draining just as the bucket reaches the 15-m level. find the work done. (use 9.8 m/s2 for g.) show how to approximate the required work by a riemann sum. (let x be the height in meters above the ground. enter xi* as xi.) lim n → ∞ n (9.8)(45−3 xi) i = 1 δx express the work as an integral. 0 dx evaluate the integral. (round your answer to the nearest integer.) j