Junior Lyceum Annual Examinations In Physics Form 5 - 2011 Page 3
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112.
The graph below shows the motion of Luca‘s car during the last 24 s before coming to a
complete stop in front of his house.
Graph of velocity against time
12
Q
P
10
8
6
v (m/s)
4
2
R
0
0
4
8
12
16
20
24
a.
t (s)
From the graph:
i.
1
PQ shows that the car was moving at a constant velocity of ________ m/s.
ii.
1
The car decelerates uniformly during the last ________ s of Luca’s journey.
b.
Luca’s car has a mass of 920 kg while Luca has a mass of 80 kg. Calculate the:
i.
1
total mass of Luca and his car,
ii.
2
total kinetic energy in J of Luca and his car just before he started to brake,
c.
Using the graph or otherwise calculate the:
2
i.
2
value of the deceleration of Luca and his car in m/s
,
ii.
1
average force in N required during deceleration.
Physics – Junior Lyceum – Form 5 – 2011
Page 3 of 11
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