plot a velocity-time graph showing +a (positive acceleration) and -a (negative acceleration).
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Take 1st equation of linear motion.That is v = u+at
at = v-u
a = (v-u)/t
acceleration = rate of change of velocity
That means,acceleration is given by the slope of velocity vs time (v-t) graph.
If there is a
positive acceleration⇒ positive slope in v-t graph⇒
make acute angle with positive x axis
negative acceleration⇒negative slope in v-t graph⇒
make obtuse angle with positive x axis
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