(c)Is the kinetic energy of the bullet-bob system immediately after the collisio

Question

(c)Is the kinetic energy of the bullet-bob system immediately after the collision greater than, less than, or the same as the kinetic energy of the system just before the collision?

The kinetic energy of the bullet-bob system immediately after the collision is less than the kinetic energy of the system just before the collision. (EXPLAIN WHY THIS IS TRUE IN JUST A FEW SENTENCES "NOT MATH")

A 9.00-{rm g} bullet, moving horizontally with an initial speed v_0, embeds itself in a 1.20-{rm kg} pendulum bob that is initially at rest. The length of the pendulum is L = 0.750 m. After the collision, the pendulum swings to one side and comes to rest when it has gained a vertical height of 13.0 cm. (c)Is the kinetic energy of the bullet-bob system immediately after the collision greater than, less than, or the same as the kinetic energy of the system just before the collision? The kinetic energy of the bullet-bob system immediately after the collision is less than the kinetic energy of the system just before the collision. (EXPLAIN WHY THIS IS TRUE IN JUST A FEW SENTENCES NOT MATH)

Explanation / Answer

less than. --------------------- because when the bullet hit the pendulum bob, it cant just hit the bob then stop, it will penetrate into the inner of the bob. And when the bullet goes into the bob, there is friction force that turn to heat from the kinetic energy of the bullet. So thats why total energy is decreased.

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