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A 004-Kg Ball Is Thrown from the Top of a 30-M

Question 13

Multiple Choice

A 0.04-kg ball is thrown from the top of a 30-m tall building (point A) at an unknown angle above the horizontal.As shown in the figure,the ball attains a maximum height of 10 m above the top of the building before striking the ground at point B.If air resistance is negligible,what is the value of the kinetic energy of the ball at B minus the kinetic energy of the ball at A (KB − KA) ? A 0.04-kg ball is thrown from the top of a 30-m tall building (point A) at an unknown angle above the horizontal.As shown in the figure,the ball attains a maximum height of 10 m above the top of the building before striking the ground at point B.If air resistance is negligible,what is the value of the kinetic energy of the ball at B minus the kinetic energy of the ball at A (K<sub>B</sub> − K<sub>A</sub>) ? A) 12 J B) −12 J C) 20 J D) −20 J E) 32 J


A) 12 J
B) −12 J
C) 20 J
D) −20 J
E) 32 J

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