Snow is falling vertically at a constant speed of `8 m//s`. (a) At what angle from the vertical and (b) with what speed do the snow flakes appear to be falling as viewed by the driver in a car travelling on a straight road with a speed of `21.6 km//hr` ?

Answer

(a) `tan^(-1) (3//4) ~= 37^(@)` (b) 10 m/s

Explanation

Speed of driver `= 21.6 xx (5)/(18) = 6.0 m//s`
`tan theta = (6)/(8)`
`theta = tan^(-1) ((3)/(4))`