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A particle moves in a straight line with a constant acceleration. It changes its velocity from `10 ms^-1` to `20 ms^-1` while passing through a distance `135 m` in `t` seconds. The value of `t` is.A. `12`B. `9`C. `10`D. `1.8` |
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Answer» Correct Answer - B (2) `(20)^(2)=(10)^(2)-2axx135` `a=300/270=10/9 m//s^(2)` `20=10+a t=10+10/9 t` `t=9 s` OR `s=((u+v)/2)t` `135=((10+20)/2)timpliest=9s` |
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