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

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?

Grade:12

2 Answers

Badiuddin askIITians.ismu Expert
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


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 All the best manoj
 
 

Regards,

Askiitians Experts

Badiuddin

ankit singh
askIITians Faculty 614 Points
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
 

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