Page 10 - Modul A+1 Fizik Tingkatan 4

(iii) Hitungkan halaju akhir bagi troli tersebut.
Calculate the final velocity of the trolley.
24
v = —––
0.2
= 120 cm s –1
[2 markah/marks]
(c) Lakarkan graf halaju melawan masa pada ruang di bawah.
Sketch a graph of velocity against time at the space below.

v/cm s -1

120
BAB 2 100

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80

60
40

20

t/s
0.2 0.4 0.6 0.8 1.0 1.2
[2 markah/marks]

2. Rajah 2.1 menunjukkan graf halaju-masa seorang penerjun selepas melompat dari sebuah kapal terbang.
Diagram 2.1 shows a velocity-time graph of a parachutist after jumping out from an aeroplane. KBAT Menilai
v/m s -1

R S
50
40

Q
30
20

T U
10
P t = 45
0 t/s
10 20 30 40 50 60 70
Rajah/Diagram 2.1

(a) (i) Nyatakan masa payung terjun itu mula terbuka. Tunjukkan pada graf bagaimana anda menentukan masa.
State the time of the parachute starts to open. Show on the graph how you determine the time.
45 s
[2 markah/marks]
(ii) Berikan sebab bagi jawapan anda di (a)(i).
Give reason for your answer at (a)(i).

Halaju mula berkurang / The velocity starts to decrease
[1 markah/mark]
(b) Hitung pecutan penerjun itu di PQ.
Calculate the acceleration of the parachutist at PQ.
30 – 0
a = ———
10 – 0
= 3 m s –2
[2 markah/marks]

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