A force of $2\hat i + 3\hat j + 4\hat k\;N$acts on a body for $4$ second, produces a displacement of $(3\hat i + 4\hat j + 5\hat k)m.$The power used is.......$W$
A force of $2\hat i + 3\hat j + 4\hat k\;N$acts on a body for $4$ second, produces a displacement of $(3\hat i + 4\hat j + 5\hat k)m.$The power used is.......$W$
$9.5$
$7.5$
$6.5$
$4.5$
A force of $2\hat i + 3\hat j + 4\hat k\;N$acts on a body for $4$ second, produces a displacement of $(3\hat i + 4\hat j + 5\hat k)m.$The power used is.......$W$
$P = \frac{{\overrightarrow F .\overrightarrow s }}{t} = \frac{{(2\hat i + 3\hat j + 4\hat k).(3\hat i + 4\hat j + 5\hat k)}}{4}$$ = \frac{{38}}{4} = 9.5\;W$
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