9514 1404 393
Answer:
68.6 m/s
Step-by-step explanation:
The speed at a given time is the derivative of the height at that time.
dh/dt = -9.8t
At t=7, the speed is ...
-9.8(7) = -68.6 . . . . . meters per second (downward)
The speed is 68.6 meters per second.
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<em>Additional comment</em>
Height is considered to be positive in the up direction, so velocity and acceleration are also positive in the up direction. The derivative of height will be the velocity. Its negative sign in this case indicates the object is moving in the downward direction. The speed is the magnitude (absolute value) of the velocity.
You can start with the formula for area of a rectangle, then solve for the length.
area = length*width
73000 m² = length*(5025 m)
73000 m²/(5025 m) = length ≈ 14.53 m
Answer:
The first part is B= -2t + 95.
Step-by-step explanation:
Every hour the battery drops by 2 so the equation is
current battery charge= (time)(-2)+(starting battery charge)
