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#### karush

##### Well-known member

- Jan 31, 2012

- 2,725

At $t=8\, s$ its velocity is $-1\, m/s$

(a) Find the average acceleration for this interval.

$$a_{av}=\frac{v_2-v_1}{t_2-t_1}=\frac{\Delta v}{\Delta t}$$

So

$$a_{av}=\frac{-1-5}{8-5}=\frac{-6}{3}=-2 \, m/s$$

book answer $-2\, m/s^2$

ok I think this is ok

but again was wondering if a tikx graph can be made or is acceleration a curve?