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Mathematics
Mathematics
Problem
The displacement of a particle along a line is
s
(
t
)
=
cos
(
π
t
)
s(t)=\cos(\pi t)
s
(
t
)
=
cos
(
π
t
)
cm. Which statement about the velocity at
t
=
1
s
t=1\,\text{s}
t
=
1
s
is correct? a)
v
(
1
)
>
0
v(1)>0
v
(
1
)
>
0
b)
v
(
1
)
=
0
v(1)=0
v
(
1
)
=
0
c)
v
(
1
)
<
0
v(1)<0
v
(
1
)
<
0
d)
v
(
1
)
v(1)
v
(
1
)
cannot be determined from the given information
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