Question

A projectile is fired at an angle of 30° with the horizontal so that the initial vertical velocity is 80m/s. If t be the time of flight of the projectile, what is the velocity at time t=t/4

Answer 1

time t= 2usintheta/g

t=8sec

t/4= 2 sec

vy= 40-10*2= 20 j

vx= 40√3 i

v= 40√3i+ 20j

|v|= √(vx^2+vy^2)