Ten coins are placed on top of each other on a horizontal table. If the mass of each coin is 10g and acceleration due to gravity is 10 ms-2 , what is the magnitude and direction of the force on the 7th coin (counting from the bottom) due to all the coins above it?
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a
0.3 N downwards
b
0.3 N upwards
c
0.7 N downwards
d
0.7 N upwards
answer is A.
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Detailed Solution
Force on the seventh coin = weight of the three coins above it. F = 3mg