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:
v₂ = 0.0529 [m/s]
Explanation:
To solve this problem we must use the principle of conservation of linear momentum, where momentum is conserved before or after launching the baseball. Momentum is defined as the product of mass by Velocity.
where:
P = lineal momentum [kg*m/s]
m = mass = 0.1 [kg]
v = velocity of the ball = 45 [m/s]
Now when the catcher receives the ball it will carry the same momentum as when it was thrown.