Sally and her seashells
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?
Details and assumptions
- The acceleration of gravity is .
The answer is 0.0918.
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1 solution
The total weight of the shells she sold was 63 N. There were 70 shells, so the average mass of each shell is ( 6 3 / 7 0 ) / 9 . 8 = 0 . 0 9 1 8 k g .