Multiple choice question VIII — task. Science CBSE, Class 9.

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1. When the angle between force vector and displacement vector is obtuse, the work done is:

\(1\)
\(zero\)
\(+ve\)
\(-ve\)

2. Given that \(W\ =\ \vec{F}.{s}\ =\ 0\) and \(F \neq 0\), \(s \neq 0\), then:

\(\vec{F}\) is equal to \(\vec{s}\)
\(\vec{F}\) is parallel to \(\vec{s}\)
\(\vec{F}\) is perpendicular to \(\vec{s}\)
none of these

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