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WAEC Mathematics 2014 Paper
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© africaexams.com
Question : 11
Total: 49
Make u the subject of formula, E =
m
2
g
(v
2
- u
2
)
u =
√
v
2
−
2
E
g
m
u =
√
v
2
m
−
2
E
g
4
u =
√
v
−
2
E
g
m
u =
√
2
v
2
E
g
m
Validate
Solution:
E =
m
2
g
(v
2
- u
2
)
multiply both sides by 2g
2Eg = 2g (
M
2
g
(
V
2
−
U
2
)
2Eg = m(V
2
- U
2
)
2Eg - mV
2
- mU
2
mU
2
= mV
2
- 2Eg
divide both sides by m
m
U
2
m
=
m
V
2
−
2
E
g
m
U
2
=
m
V
2
−
2
E
g
m
=
m
V
2
m
−
2
E
g
m
U
2
= V
2
-
2
E
g
m
U =
√
V
2
−
2
E
g
m
© africaexams.com
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