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Question : 67

Total: 80

In an hour–glass approximately 100 grains of sand fall per second (starting from rest), and it takes 2 sec. for each sand particle to reach the bottom of the hour–glass. If the average mass of each sand particle is 0.2 g then the average force exerted by the falling sand on the bottom of the hour–glass is close to :

0.4 N
0.8 N
1.2 N
1.6 N

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