It can either be all of them or just 1 and 3
Find refractive index first



Now






Explanation :
It is given that,
Mass of the car, m = 1000 kg
Force applied by the motor, 
The static and dynamic friction coefficient is, 
Let a is the acceleration of the car. Since, the car is in motion, the coefficient of sliding friction can be used. At equilibrium,




So, the acceleration of the car is
. Hence, this is the required solution.
it allows only a reduced number of electrons to flow through it.
the answer is A. The aluminum has 0.84 ohms more resistance.