Answer:
Step-by-step explanation:
Given
Firemen shoot the water stream at an angle of \alpha
launch speed

it takes it
to reach the building
Building is
from launch point
Considering horizontal motion




(b)At highest point vertical velocity becomes zero and there is only horizontal velocity



net acceleration will be acceleration due to gravity which will be acting downward
(c)height reached by water stream is given by

where,
y=displacement
u=initial velocity in vertical direction
a=acceleration
t=time
net velocity at this instant is the vector sum of vertical and horizontal velocity
vertical velocity



Horizontal velocity


net velocity
