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
B
4 kgms1
C
8 kgms1
D
2 kgms1

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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