A 5.00-g bullet is fired into a 800-g block of wood suspended as a ballistic pendulum.The combined mass swings up to a height of 8.00 cm.What was the kinetic energy of the bullet immediately before the collision?

Question

Quizplus · Accepted Answer

The correct answer is A.The kinetic energy of the bullet immediately before the collision is equal to the potential energy of the combined mass at the maximum height. The potential energy is given by:$$PE = mgh$$where:* m is the combined mass of the bullet and the block of wood* g is the acceleration due to gravity* h is the maximum height reached by the combined massSubstituting the given values into the equation, we get:$$PE = (5.00 g + 800 g)(9.81 m/s^2)(0.08 m) = 102 J$$Therefore, the kinetic energy of the bullet immediately before the collision was 102 J.

A 500-G Bullet Is Fired into a 800-G Block of Wood