An independent variable :)) hope I helped
Yes, for example a plain is moving so it has kinetic energy, it is also high above the ground so it has gravitational potential energy
Answer: 294 N
Explanation:
Since the Normal Force 
is equal to the weight 
of the dog, we have:
Where:
is the mass of the dog
is the acceleration due to gravity on the Earth's surface
Solving:
your answer is the letter (b)
A ) <em>Speed</em><em> </em><em>is</em><em> </em><em>a</em><em> </em><em>scalar quantity and velocity is a vector quantity.</em>
