300
The corresponding acceleration vs time graph of an object at free fall (falling vertically) is
A. Horizontal line at y=9.8
B. Horizontal line at y = 0
C. Straight line upwards starting at y=9.8
D. Vertical line at y=9.8
A?
Horizontal line means constant. Constant at 9.8 = constant acceleration due to gravity [9.8m/(s^2)]