# The speed-time graph of an ascending passenger lift is given alongside. What is the acceleration of the lift:

**(i)** during the first two seconds?

**(ii)** between second and tenth second?

**(iii)** during the last two seconds?"

**(i). **Acceleration during the first two seconds $=\frac{4.6-0}{2-0}=\frac{4.6}{2}=2.3\ m/s^2$

**(ii). **Acceleration during second and tenth seconds $=\frac{4.6-4.6}{10-2}=0$

**(iii). **Acceleration during last 2 seconds $=\frac{0-4.6}{12-10}$

$=\frac{-4.6}{2}$

$=-2.3\ m/s^2$ [-ve sign indicates retardation]

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