Final answer:
The velocity of a kiwi in free fall after 1.9 seconds would be 18.62 m/s downwards, calculated using the equation for objects in free fall. For a 1 kg brick, the kinetic energy at the start of the fall is zero and 39.2 Joules when it reaches the ground.
Step-by-step explanation:
The velocity of a kiwi in free fall 1.9 seconds after it is dropped from rest can be found using the equation of motion for an object in free fall, which is v = gt, where v is the velocity, g is the acceleration due to gravity (approximately 9.8 m/s² on Earth's surface), and t is the time in seconds. Ignoring air resistance, after 1.9 seconds, the kiwi's velocity would be v = 9.8 m/s² × 1.9 s = 18.62 m/s (downwards).
To address the reference information provided, the kinetic energy of an object is given by the equation KE = 1/2 mv², where m is the mass and v is the velocity of the object. When the brick starts to fall, its velocity is zero, so its kinetic energy is also zero. When it reaches the ground with a velocity of 8.85 m/s, its kinetic energy is KE = 1/2 × 1 kg × (8.85 m/s)² = 39.2 Joules.