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Physics
Physics
Problem
A student rewrites
s
=
(
u
+
v
)
t
2
s = \dfrac{(u+v)t}{2}
s
=
2
(
u
+
v
)
t
as
s
=
u
t
+
k
a
t
2
s = ut + k\,a t^{2}
s
=
u
t
+
k
a
t
2
by replacing
v
v
v
with
(
u
+
a
t
)
(u+at)
(
u
+
a
t
)
. What is the value of
k
k
k
that makes the step correct? a)
1
1
1
b)
1
2
\dfrac{1}{2}
2
1
c)
3
2
\dfrac{3}{2}
2
3
d)
1
4
\dfrac{1}{4}
4
1
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