Final answer:
The statement that an object released from an altitude of 1000m has a velocity of 9.8 m/s downward after a second is True, based on the physics of free fall and the constant acceleration due to gravity.
Step-by-step explanation:
The question of whether an object released from an altitude of 1000m would have a velocity of 9.8 m/s downward after a second can be answered by understanding the physics of free fall. Under the influence of gravity, in the absence of air resistance, all objects accelerate at a rate of 9.8 m/s², regardless of mass. Assuming that the object is released from rest (initial velocity is zero), the velocity of the object after 1 second would indeed be 9.8 m/s downward due to this constant acceleration.
Thus, the statement is True. The velocity of the object can be calculated using the kinematic equation:
v = gt
where v is the final velocity, g is the acceleration due to gravity (9.8 m/s²), and t is the time elapsed. Substituting the values:
v = 9.8 m/s² * 1 s
v = 9.8 m/s