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Problem
Problem
A body is projected up such that its position vector varies with time as
r
=
{
3
t
i
^
+
(
4
t
−
5
t
2
)
j
^
}
m
\mathbf{r} = \{3t \hat{i} + (4t - 5t^2)\hat{j}\} \text{ m}
r
=
{
3
t
i
^
+
(
4
t
−
5
t
2
)
j
^
}
m
. Here,
t
t
t
is in seconds. Find the time and
x
x
x
-coordinate of particle when its
y
y
y
-coordinate is zero.
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