Asked by Rhonda
I'm struggling to figure out velocity and understanding the formulas. My question I have to try and figure out is...
If a block of wood dropped from a tall building has reached a velocity of 78.4 m/s, how long has it been falling?
I just don't know how to figure it out? Can you explain please?
If a block of wood dropped from a tall building has reached a velocity of 78.4 m/s, how long has it been falling?
I just don't know how to figure it out? Can you explain please?
Answers
Answered by
Steve
you know that gravity provides constant acceleration. That means the the velocity grows by the same amount in equal time periods.
That is why g = 9.8 m/s^2
That means g = (9.8m/s)/s
Or, v grows by 9.8 m/s every second.
So, if v=9.8t after t seconds, then you want t where
9.8t = 78.4
Not so hard now, eh?
That is why g = 9.8 m/s^2
That means g = (9.8m/s)/s
Or, v grows by 9.8 m/s every second.
So, if v=9.8t after t seconds, then you want t where
9.8t = 78.4
Not so hard now, eh?
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