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It ain't from CIE questions. It's from the Coursebook CD-ROM worksheet.
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I'll post the answers. You'll be surprised just as I was.
a. horizontal velocity= s/t = 2.5/0.6= 4.17m/s
b. Vertically final velocity is zero as ball passes over cross-bar.
v = u + at
0 = u - (9.81*0.6)
u = 5.89m/s (ans)
c. u = root over(4.17^2 + 5.89^2)
= 7.21m/s
d. angle = tan^-1 (5.89/4.17)
= 55degrees
The mark scheme totally trolled me!!! I don't get it. How can horizontal velocity be 2.5/0.6 ??
okay i think this is simple but am kinda confused:
3bii.) - i don't get why to calculate the time only the vertical distance is considered
3biii.) - why do we use the horizontal velocity to calculate the speed.....and the time is the same as the journey of the ball before colliding with the wall??
Question paper: http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_qp_21.pdf
Marking scheme:http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_ms_21.pdf
please help urgently thanx so much.....May God bless you
since the ball's initial velocity after collision is perfectly horizontal, take the horizontal distance moved and divide it by the time above(1.333)Can someone please explain how they got to the velocity of the ball in question 3b (iii)
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_ms_21.pdf
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w11_qp_21.pdf
tx soooooo much!!!! God bless3.b.i v^2=u^2 - 2gs
--> 0= 13^2 - (2*9.81 s)
--> s= 8.61 ~ 8.61m
3.b.ii v= u -gt Alternatively, you can also use horizontal velocity to calculate the time.
--> 0= 13 - 9.81*t time = distance/ horizontal velocity = 9.95/7.5 = 1.33 s
--> t= 1.325 s ~ 1.33 s
3. b.iii using vertical velocity, The horizontal velocity IS THE SPEED after rebounding from P. There is no vertical speed at P since in the beginning of the question
--> s= ut + .5 gt^2 it was said "The ball hits the wall at P with a velocity that is at right angles to the wall" This means there is no vertical velocity at P.
--> 8.61 = 4.905 t^2
--> t = 1.324 s
so horizontal velocity = 6.15/1.324 = 4.64 ~ 4.6 m/s
Hope that helps man.
npkay...tx a lot
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