A classical mechanics problem by pulkit singh
The door of an automobile is open and perpendicular to the body . The automobile starts with an acceleration of 2ft/sec.sec , and the width of the door is 30inches . Treat
the door as a uniform rectangle , and neglect friction to find the speed of its outside edge as seen by the driver when the
door closes.
The answer is 3.87.
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1 solution
From moving frame of car door is like a pendulum with Potential energy m X 2 X 2.5/2 equal to kinetic energy. Kinetic energy is equal to I.W2/2