Question

3. 5 discs each of mass m are placed one above the other, the force on the first from the
bottom because of the other remaining on the top is
c) 3mg
d) 4mg
b) 2mg
a) mg​

Answer 1

Answer:

2mg mark as brainlist hope it helps you

Answer 2

5 discs each of mass m are placed one above the other, the force on the first from the  bottom because of the other remaining on the top is 4 mg.

Explanation:

• Force is given as the product of mass and acceleration.
• As the force is acting downward, the acceleration acting on the object will be acceleration due to gravity, i.e. 'g'.

• Thus, the force will be given as: $\[F = mg\]$

• The first coin from the bottom is the fifth coin from the top and four coins are placed on it.
• As the mass of one coin is m, the force applied by one coin will be $1mg$.
• Therefore, the force applied on the first coin from the bottom or the fifth coin will be the sum of force applied by the four coins placed on it.
• Thus, the force acting on the first from the  bottom because of the other remaining on the top is $4 mg$.