An object is falling in the negative y-directions with an instantaneous acceleration of 9.8
meters per second squared. How fast does it fall after 0.5 seconds?
a. 4.9 m/s y
b. 4.9 m/s -y
c. 19.6 m/s y
d. 19.6 m/s -y
please explain how, thank you!
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