Posted by **please..anyone help!!** on Monday, March 18, 2013 at 2:58am.

Sally sells seashells by the seashore. In the morning, her sack of shells weighed 70 N. She sold seventy shells and in the evening her sack weighed 7 N. What was the average mass in kg of the shells she sold?

The acceleration of gravity is −9.8 m/s2.

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**Stranger**, Monday, March 18, 2013 at 3:10am
0.0928 kg

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