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Grade: 12

                        

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 wall Can you tell me is there any chrges of putting queries?

11 years ago

Answers : (2)

Badiuddin askIITians.ismu Expert
147 Points
							

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.
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 All the best manoj
 
 

Regards,

Askiitians Experts

Badiuddin

11 years ago
ankit singh
askIITians Faculty
596 Points
							
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
 
3 months ago
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