Question

19. The momentum of a bullet of mass 10 g fired from a gun is 5 kg m/s. The kinetic energy of this bullet in kJ will be :

(a) 5 (b)1.25 (c) 12.5 (d).125​

Answer 1

Answer:

b

b. j1. 25 is the known metter of vacancy

Answer 2

Answer:

The kinetic energy of this bullet is (b)1.25

Kinetic Energy:

We must exert force on an item to accelerate it. We have to put up the effort to use force. Energy is transmitted when work is done on an item, and the thing then travels at a new, constant speed. The energy that is transported is referred to as kinetic energy, and it is influenced by the mass and speed attained.

As a scalar quantity, kinetic energy can only be fully defined by its magnitude.

Kinetic Energy Units:

Kinetic energy is measured in Joules, which are equivalent to $1 kg.m^2.s^{-2}$in the SI system.

The erg is the CGS unit for kinetic energy.

Explanation:

The mass of bullet is 10g or 0.01 kg

The momentum of the bullet is 5kg m/s

The kinetic energy of a body in terms of its momentum is given as:

$KE=\frac{p^2}{2m}$

$=\frac{5\times5}{2\times 0.01}$

$=\frac{25}{0.02}$

$=1.25 \;KJ$

The correct answer is $1.25 \; KJ$.

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