A ball is thrown down off the cliff at 12 m/s. How fast is it going 3.5 s later?
How fast is it going?
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12m/s + (3.5s)(9.8m/s2) = 46.3m/s
We know: Vinitial, acceleration, and time.
We want to find: Vfinal.
Equation containing these variables of interest: Vfinal - Vinitial=axt
Plug and Chug!
Vfinal= 12 + 9.8x3.5= 46.3 m/s