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Problem
Problem
A particle moves under the action of a force
F
=
20
i
^
+
15
j
^
\mathbf{F} = 20\hat{i} + 15\hat{j}
F
=
20
i
^
+
15
j
^
along a straight line
3
y
+
α
x
=
5
3y + \alpha x = 5
3
y
+
α
x
=
5
, where,
α
\alpha
α
is a constant. If the work done by the force
F
\mathbf{F}
F
is zero, then the value of
α
\alpha
α
is a.
4
9
\frac{4}{9}
9
4
b.
9
4
\frac{9}{4}
4
9
c. 3 d. 4
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