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Question

The kinetic energy of a moving body is given by $$K = 2v^{2}$$, $$K$$ being in joules and $$v$$ in m/s. Its momentum when traveling with a velocity of $$2\ ms^{-1}$$ will be :


A
16 kgms1
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B
4 kgms1
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C
8 kgms1
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D
2 kgms1
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Solution

The correct option is A $$8\ kg m s^{-1}$$
$$K=\dfrac{1}{2}mv^{2}=2v^{2}$$
$$\Rightarrow m=4kg$$
$$\vec{p}=m.\vec{v}$$
    $$=4\times 2$$
    $$=8\ kg m/s$$

Physics

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