The diagram below shows the acceleration vs. time for a falling object. What was true about the object at 0.5 seconds?
Acceleration vs. time
A. The object stopped moving.
B. The object reached terminal velocity.
C. The net force on the object was up.
D. The net force on the object was down.

B. The object reached terminal velocity.

Explanation:

At t=0.5, the acceleration is 0, so the velocity is constant.  So the object has reached terminal velocity, and the net force is 0.

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19

r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.