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?

• A

  0.3 N downwards

• B

  0.3 N upwards

• C

  0.7 N downwards

• D

  0.7 N upwards