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From the following displacement-time graph find out the velocity of a moving body. A. `(1)/(sqrt(3)) m//s`B. `3 m//s`C. `sqrt(3) m//s`D. `(1)/(3) m//s` |
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Answer» Correct Answer - C In first instant you will apply `v = tan theta` and say, `v = tan 30^@ = (1)/(sqrt(3)) m//s`. But it is wrong because formula `v = tan theta` is valid when angle is measured with time axis. Here angle is taken from displacment axis. So angle from time axis `90^@ - 30^@ = 60^@` Now `v = tan 60^@ = sqrt(3)`. |
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