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WAEC Physics 2022 Paper
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© africaexams.com
Question : 43
Total: 50
The engine of a car provides a forward force of 1240 N and the total resistive force on the car is 800 N . If the mass of the car is 1220 kg , determine the distance the car has to travel from the rest before acquiring a speed of
4
m
s
−
1
.
44.0 m
22.2 m
11.1 m
5.5 m
Validate
Solution:
Acceleration[a]
=
[forward-resistive]force
mass
a
=
1240
−
800
1220
⟶
440
−
800
1220
a
=
0.36
m
∕
s
2
,
v
=
4
m
∕
s
,
s
=
?
Second equation of motion:
s
is distance
u is initial velocity
v is final velocity
a is acceleration
v
2
=
u
2
+
2
as
4
2
=
0
2
+
2
*
0.36
*
s
16
=
0.72
s
22.2
m
=
s
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