A pendulum is a device which has a metallic ball (called bob) suspended by a long thread from a rigid support.

A pendulum is a device which has a metallic ball (called bob) suspended by a long thread from a rigid support.
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Distance (m) | 0 | 4 | ? | 12 | ? | 20 |
Time (s) | 0 | 2 | 4 | ? | 8 | 10 |