Two trains are moving with velocities `v_1 = 10 ms^-1 and v_2 = 20 ms^-1` on the same track in opposite directions. After the application of brakes if their retarding rates are `a_1 = 2 ms^-2 and a_2 = 1 ms^-2` respectively, then the minimum distance of separation between the trains to avoid collision is

The driver of a train moving at 72 km h^(-1) sights another train moving at 4 ms^(-1) on the same track and in the same direction. He instantly applies brakes to produces a retardation of 1 ms^(-2) . The minimum distance between the trains so that no collision occurs is

The driver of a train moving at 72 km h^(-1) sights another train moving at 4 ms^(-1) on the same track and in the same direction. He instantly applies brakes to produces a retardation of 1 ms^(-2) . The minimum distance between the trains so that no collision occurs is

A driver of train A, moving at a speed 30 ms^(-1), sights another train B going on the same track and in the same direction with speed 10 ms^(-1). He immediately applies brake that gives his train a constant retardation of 2 ms^(-2). What must be the minimum distance between trains in order to avoid a collision ?

Two particles are thrown simultaneously from points A and B with velocities u_1 = 2ms^(-1) and u_2 - 14 ms^(-1) , respectively, as shown in figure. Minimum separation between A and B is

Two particles are thrown simultaneously from points A and B with velocities u_1 = 2ms^(-1) and u_2 - 14 ms^(-1) , respectively, as shown in figure. Minimum separation between A and B is

Two particles are thrown simultaneously from points A and B with velocities u_1 = 2ms^(-1) and u_2 - 14 ms^(-1) , respectively, as shown in figure. Minimum separation between A and B is

Two trains, each 50 m long, are travelling in opposite directions with velocities 10 ms^-1 and 15 ms^-1 . The time of their crossing each other is.