A projectile is launched from the top of a tower of height 30m with an initial velocity of 20m/s at an angle of 30degree above the horizontal. Calculate 1) the time of flight to the ground 2) the velocity and impact

u = initial velocity = 20m/s

h = Height = 30m

Theta = 30°

g = acceleration due to gravity = 9.8m/s^2

Time of flight (T) = total time taken by an object reach its maximum height and return to the ground.

T = (2*u*sin (theta)) : g

T = (2*20*sin (30°)) : 9.8

T = (40 * 0.5) : 9.8

T = 20 : 9.8

T = 2.04s

Velocity (v)

v = sqrt (2gh)

v = sqrt (2*9.8*30)

v = sqrt (588)

v = 24.25m/s