A 0.60-kg object is suspended from the ceiling at the end of a 2.0-m string. When pulled to the side and released, it has a speed of 4.0 m/s at the lowest point of its path. What maximum angle does the string make with the vertical as the object swings up?
A) 61°
B) 54°
C) 69°
D) 77°
E) 47°

Question

Quizplus · Accepted Answer

Using conservation of energy, the potential energy at the maximum height equals the kinetic energy at the lowest point. Solving for the height and using trigonometry, the angle is approximately 54°.

A 060-Kg Object Is Suspended from the Ceiling at the End