A particle is fired from 'A' in the diagonal plane of building of dimension 20 m(length)x 1.5 m (breadth) x 12.5 m (height) , just clears the roof diagonally & falls on the other side of the building at B. it is observed that the particle is travelling at an angle 45^(@) with the horizontal whtn it clears tha edges P and Q of the diagonal Take g=10 m//s^(2) The angle pf projection at A will be :

A particle is fired from 'A' in the diagonal plane of building of dime

1.	A particle is fired from 'A' in the diagonal plane of building of dimension 20 m(length)x 1.5 m (breadth) x 12.5 m (height) , just clears the roof diagonally & falls on the other side of the building at B. it is observed that the particle is travelling at an angle 45^(@) with the horizontal whtn it clears tha edges P and Q of the diagonal Take g=10 m//s^(2) The angle pf projection at A will be :
Answer» `30^(@)` `45^(@)` `60^(@)` `75^(@)` Answer :C