A projectile is launched from ground level at an angle of 45 degrees above the horizontal with a speed of 40m/s. It is aimed straight towards a high wall that is a horizontal distance of 120m away from the launch point.

a) How much time will the projectile spend in the air before it hits the wall?
b) At what hight above the ground level will the projectile hit the wall?

3 answers

assume it hits wall.
distance=vh*time
120=40*cos45*time
time=30/cos45

hf=hi+vvi*timeinair-4.9 t^2
put in time t, and calculate hf.
vvi=40sin45

is hi equal to zero?

Also time = 3/cos45 not 30