### Which makes pendulum swing upward in an arc

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Q. A tsunami travelling across deep water can have the speed of 750 {rm km/h} and a wavelength of 360 km. what is the frequency?

Q. A 26 g rifle bullet travelling 250m/s buries itself in a 3.00 kg pendulum hanging on a 2.8 m long string, which makes pendulum swing upward in an arc.

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