1.

The acceleration versus time graph for a particle moving along a straight line is shown in the figure. If the particle starts from rest at t = 0, then its speed at t = 30 sec will be : A. `20m//sec`B. `40m//sec`C. `0m//sec`D. `-40m//sec`

Answer» Correct Answer - B
The acceleration ……..
For a - t curve
speed = |velocity|
speed (at t = 30 sec) `= |10xx4-4xx20|`
`= |40-80| = |-40| = 40m//sec`.


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