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Published byStella Parker Modified over 6 years ago

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Neglecting air resistance, all objects fall at a rate of 9.8 m/s 2 due to gravity Because objects fall in a downward direction, we’ll call their acceleration -9.8 m/s 2 g = acceleration due to gravity = -9.8 m/s 2 Each second that an object falls, it’s speed increases by 9.8 m/s

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The instant an object begins to fall, we will assume it’s v o to be 0 m/s We will assume maximum speed is just before the object hits the ground

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A brick is dropped from a high scaffold. What is the brick’s velocity after 4 seconds? How far does the brick fall during this time?

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t = 4 seconds v = ? d = ? Anything else?? (anything we should know?)

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Something is being dropped, so we can assume what? What do we know about acceleration? Starting distance or time?

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a = -9.8 m/s2 v o = 0 m/s d o = 0 m

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v = ? v o = 0 m/s a = -9.8 m/s 2 t = 4 sec

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-39.2 m/s why negative?

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Choose a formula…

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Plug in and solve

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-78.4 m Why negative??

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