Question asked by Filo student

3.5 A jet airplane travelling at the speed of $500\mathrm{km}{\mathrm{h}}^{-1}$ ejects its products of combustion at the speed of $1500\mathrm{km}{\mathrm{h}}^{-1}$ relative to the jet plane. What is the speed of the latter with respect to an observer on the ground? 3.6 A car moving along a straight highway with speed of $126\mathrm{km}{\mathrm{h}}^{-1}$ is brought to a stop within a distance of $200\mathrm{m}$. What is the retardation of the car (assumed uniform), and how long does it take for the car to stop ? 3.7 Two trains A and B of length $400\mathrm{m}$ each are moving on two parallel tracks with a uniform speed of $72\mathrm{km}{\mathrm{h}}^{-1}$ in the same direction, with A ahead of B. The driver of $\mathrm{B}$ decides to overtake $\mathrm{A}$ and accelerates by $1\mathrm{m}{\mathrm{s}}^{-2}$. If after $50\mathrm{s}$, the guard of $\mathrm{B}$ just brushes past the driver of $\mathrm{A}$, what was the original distance between them ? $3.8$ On a two-lane road, car A is travelling with a speed of $36\mathrm{km}{\mathrm{h}}^{-1}$. Two cars B and $\mathrm{C}$ approach car A in opposite directions with a speed of $54\mathrm{km}\mathrm{h}{\mathrm{h}}^{-1}$ each. At a certain instant, when the distance $AB$ is equal to $AC$, both being $1\mathrm{km}$, $B$ decides

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Updated on: Feb 5, 2023