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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` |
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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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