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Physics
Physics
Problem
The velocity of a
1.5
kg
1.5\,\text{kg}
1.5
kg
object in the
x
x
x
–
y
y
y
plane is given by
v
(
t
)
=
5
t
i
^
+
2
t
2
j
^
\mathbf{v}(t)=5 t\,\hat{i}+2 t^{2}\,\hat{j}
v
(
t
)
=
5
t
i
^
+
2
t
2
j
^
m s
−
1
^{-1}
−
1
, where
t
t
t
is in seconds. What is the net force on the object at
t
=
2
s
t = 2\,\text{s}
t
=
2
s
? a)
(
15
i
^
+
24
j
^
)
N
(15\,\hat{i}+24\,\hat{j})\ \text{N}
(
15
i
^
+
24
j
^
)
N
b)
(
5
i
^
+
8
j
^
)
N
(5\,\hat{i}+8\,\hat{j})\ \text{N}
(
5
i
^
+
8
j
^
)
N
c)
(
7.5
i
^
+
12
j
^
)
N
(7.5\,\hat{i}+12\,\hat{j})\ \text{N}
(
7.5
i
^
+
12
j
^
)
N
d)
(
7.5
i
^
+
6
j
^
)
N
(7.5\,\hat{i}+6\,\hat{j})\ \text{N}
(
7.5
i
^
+
6
j
^
)
N
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