Francesca J
New member
A brick is dropped (zero initial speed) from the roof of a building. The brick strikes the ground in 4.85 s. Air resistance may be ignored, so the brick is in free fall.
(a) How tall, in meters, is the building?
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I have the 4 DVAT equations:
final Velocity = initialVelocity + acceleration(time)
finalVelocity^2 = initialVelocity^2 + 2acceleration(displacement)
displacement = (1/2)( finalvelocity + initialvelocity) (time)
or displacement = initialVelocity(times) + (1/2)(acceleration)(time^2)
We're supposed to use those equations, but from the problem, I can only find 2 factors - the initial velocity and the time. How do I solve for 2 variables? I tried a system of equations, but I found that you can only use the 3rd equation, please help??
(a) How tall, in meters, is the building?
---------
I have the 4 DVAT equations:
final Velocity = initialVelocity + acceleration(time)
finalVelocity^2 = initialVelocity^2 + 2acceleration(displacement)
displacement = (1/2)( finalvelocity + initialvelocity) (time)
or displacement = initialVelocity(times) + (1/2)(acceleration)(time^2)
We're supposed to use those equations, but from the problem, I can only find 2 factors - the initial velocity and the time. How do I solve for 2 variables? I tried a system of equations, but I found that you can only use the 3rd equation, please help??