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Mechanics - projectiles question

A child is trying to throw a small stone to hit a target painted on a vertical wall. The child and the wall are on the horizontal ground. The child is standing a horizontal distance of 8m from the base of the wall. The child throws the stone from a height of 1m with speed 12ms−1 at an angle of 20° above the horizontal.
(i) Find the direction of motion of the stone when it hits the wall.

I honestly don't know where to even start. Can someone direct me, please?
Reply 1
Avatar for Notnek
Notnek
21
Original post by kurro
A child is trying to throw a small stone to hit a target painted on a vertical wall. The child and the wall are on the horizontal ground. The child is standing a horizontal distance of 8m from the base of the wall. The child throws the stone from a height of 1m with speed 12ms−1 at an angle of 20° above the horizontal.
(i) Find the direction of motion of the stone when it hits the wall.

I honestly don't know where to even start. Can someone direct me, please?

To find the direction of motion of the stone you'll need to find the horizontal velocity (easy) and vertical velocity (suvat) at the point the stone hits the wall and then use trig to find the angle. Please try that and post your working.
Original post by Notnek
To find the direction of motion of the stone you'll need to find the horizontal velocity (easy) and vertical velocity (suvat) at the point the stone hits the wall and then use trig to find the angle. Please try that and post your working.

By doing what you said I eventually got 14.1 to the horizontal.
My friends got the same answer too.

Thank you!
Reply 3
Avatar for Euler7
Euler7
13
I got 24° (2sf) but it may be wrong.
Original post by Euler7
I got 24° (2sf) but it may be wrong.


Oh damn 😂😂

I better find the mark scheme lmao

And thank you! Imma quadruple check this :smile:
Reply 5
Avatar for Notnek
Notnek
21
Original post by kurro
Oh damn 😂😂

I better find the mark scheme lmao

And thank you! Imma quadruple check this :smile:

If you don't find the mark scheme let me know - I can try it myself later.
Reply 6
Avatar for Euler7
Euler7
13
Original post by kurro
Oh damn 😂😂

I better find the mark scheme lmao

And thank you! Imma quadruple check this :smile:


Please post the answer as I'd like to know. I did it in a hurry so I might be wrong
Reply 7
Avatar for ibyghee
ibyghee
19
Original post by kurro
Oh damn 😂😂

I better find the mark scheme lmao

And thank you! Imma quadruple check this :smile:


ye i got 14.2
Original post by ibyghee
ye i got 14.2


ayyy
Original post by Notnek
If you don't find the mark scheme let me know - I can try it myself later.


Original post by Euler7
Please post the answer as I'd like to know. I did it in a hurry so I might be wrong


dw guys i gotch u:

vx=12cos20
8 = 12tcos20
vy=12sin20 –gcv(t)
tanθ= vy / v
14.2° below horizontal

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