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A pendulum bob is suspended on a flat ca...

A pendulum bob is suspended on a flat car that moves with velocity `v_(0)`. The flat car is stopped by a bumper:
(a) What is the angle through which the pendulum swings.
(b) If the swing angle is `theta = 60^(@)` and `1 = 5m`, what was the initialy speed of the flat car ?

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