A body is projected horizontally from a height of 78.4 m with a velocity10ms^(-1). Its velocity after 3 second is : (g=10ms^(-2))(Take direction of projection onvec(i) andvertically upward direction onvec(i) ).

A body is projected horizontally from a height of 78.4 m with a veloci

1.	A body is projected horizontally from a height of 78.4 m with a velocity10ms^(-1). Its velocity after 3 second is : (g=10ms^(-2))(Take direction of projection onvec(i) andvertically upward direction onvec(i) ).
Answer» `10 hat(i) - 30 hat(J)` `10 hat(i) + 30 hat(j)` `20 hat(i) - 30 hat(j)` `10 hat(i) + 10 sqrt(3)hat(j)` Answer :A