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Sahay Sir > Question Answers > NEET Last 32 Years Solved 1988 - 2019 Physics and Chemistry Video Solutions > Physics > Chapter 3 - Motion in a Straight Line > A particle moves along a straight line OX. At a time t(in seconds) the distance x(in meters)of the particle from 0 is given by:-x = 40 + 12t − t3. How long would the particles travel before coming to rest?

A particle moves along a straight line OX. At a time t(in seconds) the distance x(in meters)of the particle from 0 is given by:-x = 40 + 12t − t3. How long would the particles travel before coming to rest?

A car moves from X to Y with a uniform speed vu​ and returns to Y with a uniform speed vd​. The average speed for this round trip is