Question

a object is thrown horizontally from a point A.The ball hits the ground at a pointB.the line of sight from AtoB makes 60ºwith horizontal.ifg=10m/s^2,the velocity of projectionif the time of flight is route 3sec.is

Answer 1

since,we know that,
T=(2usinθ)/g
3=(2×u×sin60°)/g
3×10=(2×u×√3)/2
30=u√3
u=10√3 m/s