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Physics Paper 12 How was it

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i guess they didn't ask about the time that the light takes to reach the eyes, they were just talking about the time to reach the wall
I am not sure about the exact wording of the question, but I read it more than once and it mentioned the time it took for be reflected also.
 
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wat was the ans to the question of the sound wave between x nd y? 33cm nd 330ms-2 one?
 
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What was the correct answer to the red and green lamps and black wire question? And anybody remember the question in which the displacement of the particle was asked?
 
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No it said distance between maximum and minimum, so it's lambda over four. A is the awnser.
Also how did you guys get 0.12??? I did area of trapezium and I got 0.8
 
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k dude u knw da friction is 6N
so force-friction=resultant (ma)
force= 2*10=20N friction=6N total mass is 8+2=10N substitue in da eqn
20-6=10a
a=1.4ms-2
hope u get it..
u wont do the total mass....the mass of only 8 kg i think...coz forward force is being applied on that...
 
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