Answer:
The value is 
Explanation:
From the question we are told that
The velocity is
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The time taken is 
The time taken for contact is 
The velocity of the of the car after contact is
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From the equation of kinematics we have that

Here u = 0 \ m/s since the car is initially motionless
=> 
=> 
Answer:
here
Explanation:
Copper is commonly used as an effective conductor in household appliances and in electrical equipment in general. Because of its low cost, most wires are copper-plated. You will often find electromagnet cores normally wrapped with copper wire
Explanation:
Below is an attachment containing the solution
Answer: The electric repulsion between the two protons is stronger than the gravitational attraction.
Explanation: Please see the attachments below
Answer:

Explanation:
Hello,
In this case, considering that the acceleration is computed as follows:

Whereas the final velocity is 28.82 m/s, the initial one is 0 m/s and the time is 4.2 s. Thus, the acceleration turns out:

Regards.