You will already have learned about deceleration. We can also find this from speed-time graphs:
As with accelerations, the gradient (or steepness) of the line indicates the deceleration. For the red line this is found as follows:
For the green line the gradient is -10 / 20 = -0.5 m/s/s. Note that both gradients are negative (they slope downwards) so these are decelerations, not accelerations.
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The red line shows a deceleration from 30 to 0 m/s in 10 s. The green line shows a slower deceleration from 10 to 0 m/s over 20 s.
