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The distance covered by an object (in meter) is given by `s=8 t^(3)-7t^(2)+5t` Find its speed at t = 2 s. |
Answer» As speed `=("Distance")/("Time")` `therefore` Speed `=(ds)/(dt)` `=(d)/(dt)(8t^(3)-7t^(2)+5t)=24t^(2)-14+5` `therefore` Speed object at any instant of time is `(24t^(2)-14t+5)ms^(-1)` At t = 2 Speed `=24(2)^(2)-14(2)+5=73 ms^(-1)` |
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