Which condition describes an object having terminal velocity?
2 answers:
Answer:
C. Gravity = air resistance
Explanation:
An object falling down has two forces acting on him:
- Gravity, which acts downward --> the magnitude of this force is constant (equal to , where m is the mass of the object and g is the gravitational acceleration)
- Air resistance, which acts upward --> the magnitude of this force is directly proportional to v, the speed of the object
When the object starts its fall, the speed is zero (v=0) so only gravity acts and it accelerates the object downward. Therefore, the speed of the object increases, and so does the air resistance, until a point where the air resistance becomes equal to gravity (which is constant): when this occurs, the acceleration of the object becomes zero (because forces are balanced), so the object continues its fall at constant velocity, called terminal velocity.
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ANSWER
EXPLANATION
Parameters given:
Initial velocity, u = 26.2 m/s
When the vase reaches its maximum height, its velocity becomes 0 m/s. That is the final velocity.
We can now apply one of Newton's equations of motion to find the height:
where a = g = acceleration due to gravity = 9.8 m/s²
Therefore, we have that:
That is the height that the vase will reach.