Mary travelled 70 miles/hour due north. This is an example of what?
2 answers:
Answer:
velocity.
Explanation:
Velocity is a vector quantity, which consists of:
- a magnitude, which is equal to the ratio between the displacement of an object and the time taken for the displacement to occur:
- a direction, which is equal to the direction of the displacement
In this case, we are given both the magnitude (70 miles/hour) and the direction (north), so this is an example of velocity.
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The original kinetic energy will be 0 J and the final kinetic energy will be 7500 J and the amount of work utilized will be similar to the final kinetic energy i.e., 7500 J.
<u>Explanation:</u>
As it is known that the kinetic energy is defined as the energy exhibited by the moving objects. So the kinetic energy is equal to the product of mass and square of the velocity attained by the car. Thus,
So the initial kinetic energy will be the energy exerted by the car at the initial state when the initial velocity is zero. Thus the initial kinetic energy will be zero.
The final kinetic energy is
= 7500 J
As the work done is the energy required to start the car from zero velocity to 5 m/s velocity.
Work done = Final Kinetic energy - Initial Kinetic energy
Thus the work utilized for moving the car is
Work done = 7500 J - 0 J = 7500 J
Thus, the initial kinetic energy of the car is zero, the final kinetic energy is 7500 J and the work utilized by the car is also 7500 J.