Tue November 20, 2012 By:

if velocity is decreasing then how acceleration be positive as the velocity-time graph is negative?

Expert Reply
Wed November 21, 2012
Say  a ball bounces back from the wall(point A) to the point B as shown:
The velocity-time graph shows a line with a positive (upward) slope (meaning that there is a positive acceleration); the line is located in the negative region of the graph (corresponding to a negative velocity). The acceleration-time graph shows a horizontal line in the positive region of the graph (meaning a positive acceleration).
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