Answer :
Given that,
Mass of each washer = 4.9 g
We need to calculate the mass of two washers in kg
Using conversion of unit
Mass of each washer [tex]m= 4.9\times10^{-3}\ Kg[/tex]
So, Mass of two washers is
[tex]M=2\times m[/tex]
Put the value of m
[tex]M=2\times4.9\times10^{-3}\ k[/tex]
[tex]M=0.0098\ Kg[/tex]
If 4 washer are attached to the spring
We need to calculate the applied force on the car
Using formula of force
[tex]F=mg[/tex]
Put the value into the formula
[tex]F=4\times4.9\times10^{-3}\times9.8[/tex]
[tex]F=0.192\ N[/tex]
Hence, (i), The mass of two washers is 0.0098 kg.
(ii). The applied force on the car is 0.192 N.
