Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > The velocity of water current in a river changes with distance along the perpendicular to the river according to the law u = 2u0 dy for 0 ≤ y ≤ d2 where u0 = velocity in the mid-stream d = width of the river = 2u0d (d − y) for d2 ≤ y ≤ d. A boat travels from a point O on one block of the river to the opposite bank and its steering angle is constantly changed to keep its relative velocity perpendicular to the river current. Calculate the time in which the boat will reach the other bank. The velocity of the boat in still water is u0.

The velocity of water current in a river changes with distance along the perpendicular to the river according to the law u = 2u0 dy for 0 ≤ y ≤ d2 where u0 = velocity in the mid-stream d = width of the river = 2u0d (d − y) for d2 ≤ y ≤ d. A boat travels from a point O on one block of the river to the opposite bank and its steering angle is constantly changed to keep its relative velocity perpendicular to the river current. Calculate the time in which the boat will reach the other bank. The velocity of the boat in still water is u0.

A train of length l=350m starts moving rectilinearly with constant acceleration w=3.0⋅10-2m/s2 B decides to overtake A before C does.What minimum acceleration of car B ia required to avoid an accident? both being 1 km car A is travelling with a speed of 36km/h.Two cars B and C approach car A in opposite directions with a speed of 54km/h each. At a certain instant when the distance AB=AC On a two lane road t=30s after the start the locomotive headlight is switched on (event 1)