A thin block of soft wood with a mass of 0.088 kg rests on a horizontal friction

Question

A thin block of soft wood with a mass of 0.088 kg rests on a horizontal frictionless surface. A bullet with a mass of 4.77 g is fired with a speed of 595 m/s at a block of wood and passes completely through it. The speed of the block is 15 m/s immediately after the bullet exits the block. (a) determine the speed of the bullet as it exits the block (m/s). (b) Determine if the final kinetic energy of this system is equal to, less than, or greater than the initial kinetic energy. (c) verify your answer to part (b) by calculating the initial and final kinetic energies of the system (J).

Explanation / Answer

To resolve this problem you have to know about Kinetic energy and Momentum

Step 1:

Definition:  

Kinetic energy: of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.

Momentum: In classical mechanics, linear momentum or translational momentum. Is the product of the mass and velocity of an object. For example, a heavy truck moving rapidly has a large momentum

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