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Sahay Sir > Question Answers > Arihant Physics by D.C Pandey > Volume 1 > Chapter 3 - Motion in One Dimension > A glass wind screen whose inclination with the vertical can be changed is mounted on a car. The car moves horizontally with a speed of 2m/s. At what angle α with the vertical should the wind screen be placed so that the rain drops falling vertically downwards with velocity 6m/s strike the wind screen perpendicularly?

A glass wind screen whose inclination with the vertical can be changed is mounted on a car. The car moves horizontally with a speed of 2m/s. At what angle α with the vertical should the wind screen be placed so that the rain drops falling vertically downwards with velocity 6m/s strike the wind screen perpendicularly?

Two particles are moving with velocities v1 = i - tj + k and v2 = ti + tj + 2k m/s respectively. Time at which they are moving perpendicular to each other is ........(second)