Answer:
Hello There!
It is Speed.
Because in the question it is said that at which speed car is travelling.
Speed is a scalar quantity.
If it is velocity then first know this that it is a vector quantity.
It must include both magnitude and direction.
If it is velocity then it would be 40 mph east or west or north or south.
<h2>I hope it is helpful to you...</h2><h3>Cheers!_____________</h3>
As per the question, the system consists of two cars.
The the masses of two cars are denoted as-
The two cars undergoes collision with each other. Here collision must be inelastic in nature.
Let the velocities of each car is denoted as-
It is given that masses of two cars and initial velocities-
First we have to calculate the total momentum of the system before collision.
The momentum of a body is the product of its mass with velocity.
Momentum of car 1:
The momentum of car 2:
Now the total momentum of the system is :
Now we are asked to calculate the total momentum of the system after collision.
The basic condition in case of any type of collision is that it is in accordance with law of conservation of linear momentum.
Hence, the momentum will be conserved here.
It means the total momentum before collision must be equal to the total momentum after collision.
Hence, the correct answer to the question will be 2400 kg m/s.
Answer:
The current through it will also decrease to half of its former value because according to Ohm's law the current flowing through a resistor is directly proportional to the potential difference applied across its ends provided that the temperature and some other necessary conditions remain constant.
This is mathematically represented as follows;
The current is thus given as
if R is constant and V is reduced to half, then we have the following;
Simplifying further we obtain
Equation (3) shows that the current I is also reduced to half.