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# A projectile shot an angle of 60° above the horizontal strikes a wall 30 m away at apoint15 m above the point of projection .(a) Find the speed of projection(b) Find the magnitude of velocity of the projectile when it strikes the wallCan you tell me is there any chrges of putting queries?

147 Points
11 years ago

dear manoj

use the formula y=xtanθ-gx2/(2u2cos2θ)

here y= 15m

x=30 m

θ=60

then calculate u

u=21.85 m/s

magitude of the velocity when it hit the wall can be calculated as

v2=u2-2gh

=(21.85)2-2*9.81*15

v=13.53 m/s

please feel free to post as many doubts on our discussion forum as you can. If you find any question Difficult to understand - post it here and we will get you the answer and detailed solution very quickly.

All the best manoj

Regards,

ankit singh
one year ago
use the formula y=xtanθ-gx2/(2u2cos2θ)
here y= 15m
x=30 m
θ=60
then calculate u
u=21.85 m/s (speed of projection)
magitude of the velocity when it hit the wall can be calculated as
v2=u2-2gh
=(21.85)2-2*9.81*15