Physics, asked by kotakridham, 7 months ago

A bullet penetrates a wooden block and loses its velocity by a half. What is the ratio between

the initial kinetic energy of the bullet and kinetic energy when the bullet leaves the block? ​

Answers

Answered by Arif007
13

Answer:

4:1

Explanation:

Maybe just simply kinetic energies k ratio daal do since mass to change krega nhi aur final velocity u/2 (if u is initial velocity).

Answered by ashutoshmishra3065
2

Answer:

Explanation:

We must exert force on an object to accelerate it. We have to put up the effort to use force. Energy is transmitted when work is done on an object, and the thing then moves 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.

The amount of labour an object can accomplish through motion is measured by its kinetic energy.

Given:

Bullet breaks through the block and loses half of its speed.

Aim:

ratio between the bullet's initial kinetic energy and its final kinetic energy when it departs the block.

Let V represent the bullet's starting speed.

Initial Kinetic energy = 1/2 mv^{2}

Final velocity of the bullet = v / 2

Final kinetic energy = 1/2 m (v/2)^{2}

Ratio = 1/2 mv^{2} / 1/2 m (v^{2} / 4 ) = 4 /1

ki/ kf = 4/1

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