A Second's pendulum gains 2 minutes a day. To make it to keep correct time its length

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Question:A Second's pendulum gains 2 minutes a day. To make it to keep correct time its length

1.must be decreased

2. must be increased

3.is not changed but weight of the bob is increased

4. is not changed but weight of the bob is decreased

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  1. A Second's pendulum gains 2 minutes a day. To make it to keep correct time its length
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