A 120, g mass has a velocity vec v = 2ha | vedclass

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Question

$\mathrm{K.E}=\frac{1}{2} \mathrm{mv}^{2}$

$=\frac{1}{2} m(\vec{v} . \vec{v})$

$=\frac{1}{2} m(2 \hat{i}+5 \hat{j}) \cdot(2 \hat{i}+5 \hat{j})$

Vedclass · Accepted Answer

$1.74$

Vedclass · Answer

$\mathrm{K.E}=\frac{1}{2} \mathrm{mv}^{2}$

$=\frac{1}{2} m(\vec{v} . \vec{v})$

$=\frac{1}{2} m(2 \hat{i}+5 \hat{j}) \cdot(2 \hat{i}+5 \hat{j})$

$=\frac{1}{2} 	imes \frac{120}{1000}(4+25)$

$=1.74 \mathrm{J}$

A $120\, g$ mass has a velocity $\vec v = 2\hat i + 5\hat j\,m{s^{ - 1}}$ at a certain instant. Its kinetic energy is .................. $\mathrm{J}$

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