A ball is thrown vertically upward with an initial velocity of 40.0 meters per second. What will be its velocity after 2.00 seconds?
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Correct Answer:
A. 20.4 m/s.
v = v(0) + at. Here is a quick tip to speed up a question like this on the exam. Estimate the acceleration due to gravity using a = -g = -9.8 m/s^2 ~ -10 m/s^2. The velocity is approximately:
v = v(0) + at
v = 40 m/s – 10 m/s^2 (2 s)
v = 40 m/s – 20 m/s = 20 m/s
The closest answer to 20 m/s is A.
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Photo attributed to StuSteeger.
