# Suggested answers to GCE O Level 2014 Math (4016) Paper 2

• ### O-LEVEL PHYSICS TOPICAL CRASH COURSE

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1(a) x < 1/2

1(b)(i) W = 126

1(b)(ii) u = +- Sqrt(v^2 – 2W/m)

1(c)  2x / (x – 4y)

1(d) x = 7 or -1

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2(a) 4.12 x 10^10 kWh

2(b) 40.5% (to 3 SF)

2(c) 1439 kWh (to the nearest kWh)

2(d) 26.2% (to 3 SF)

2(e) 5725 GWh (to the nearest GWh)

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3(a) p = 11.4

3(b) cubic graph

3(c) Near exact answers are x = -1.54, 3.84 or 1.69 (examiners accept answers within a small range)

3(e) (i) straight line with positive gradient intersects the curve at one point.

3(e)(ii) Near exact answer is (4.24, 0.83) (examiners accept answers within a small range)

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4(a) 83 deg

4(b) Use AA property

4(c) Triangle EAB

4(d)(I) 5:3

4(d)(ii) 82.62 cm squared

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5(a)(I) (-6, -7) in vertical form (2×1 matrix)

5(a)(ii) 9.22 units

5(a)(iii) (4, 8.5)

5(b)(I) 4y + 3x = 16

5(b)(ii) (-2, 5.5)

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To be continued …….

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### 9 Responses to Suggested answers to GCE O Level 2014 Math (4016) Paper 2

1. Merry Christmas says:

For question 1(b)(ii) if I didn’t put +- in front of square root, am I wrong?

Yes, 1 mark deducted, as the question did not specify that u has to be a positive number. In fact, the equation W = (1/2)m(v^2-u^2) is taken from Physics, where the net work done by an object is equal to the change in its kinetic energy, u and v representing velocities which allow for directional signs.

2. Joshua says:

For 3 (c), i did -1.50, 1.70 and 3.80! Stupid me for correcting to 3 sf! How?

-1.50 and 1.70 are acceptable. 3.80 is a too far off.

3. Joshua says:

My gradient is -4.44 for question 3d! which is far off from your -5.2!

What will be the likely cut off for A1? Please let it NOT be 92 to 95% ……. o dear!

Yes, -4.44 would be marked wrong. I think this time the A1 will be around 90%.

4. Jaslyn says:

Two days and not updated yet from Question 3?