A ball is thrown straight up at 15 m/s (g = 10 m/s²).
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A ball is thrown straight up at (). At the top it has zero velocity for an instant. Is its acceleration zero then? Find its velocity before and after the top.
Need a reminder? The key ideaShow
Acceleration , in . It is positive when the velocity grows and negative when it falls in the positive direction.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Velocities. Taking up as positive: one second before the top, at the top, one second after.
Step 2. Acceleration. The velocity changes by every second, even through the top: .
Answer: No. Its acceleration is downward even when its velocity is zero.
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