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A particle has a rectilinear motion and the figure gives its displacement as a function of time. Which of the following statement are true with respect to the motion. A. in the motion between O and A the velocity is positive and acceleration is negativeB. between A and B the velocity and acceleration are positiveC. between B and C the velocity is negative and acceleration is positiveD. between C and D the acceleration is positive |
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Answer» Correct Answer - A::C v = 10 `a = - 5` `2as = v^(2)-u^(2)` `-2 xx 5 xx 3 = 0 - 100` s = 10m `v = 0 " at "t =(u)/(a)` `t = (10)/(5)=2s` Distance travelled in first 3 seconds = distance connect in first 2 seconds + distance covered in first 2 second + distance covered in 3rd second. `=(10xx20-(1)/(2) xx5xx2^(2))+((1.5)/(2)xx1^(2))` `= 20 -10+(5)/(2)=12.5m` |
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