Ten one rupee coins are put on top of each other on a table.each coin has a mass m. Which of the following is not true
A ) the force on the 6th coins (counted from the bottom) due to all the coins on its top is equal to 4mg( downwards).
B) the force on 6th coins due to 7th coin is 4mg (downwards)
C) the reaction of the 6th coins on the 7th coin is 4mg (upwards)
D) the total force on the 10th coins is 9mg (downwards)
