Answer:

Explanation:
To give this problem a solution, it is necessary to use the kinematic equations. The equation that describes velocity as a function of acceleration is given by,

Since there is a loss of 11.9%, in the final speed, that is to say that of the total speed, only 88.1% is the effective one, so

Re-arrange to find a,


Applying Newton's second law we have now that



Acceleration is a vector because it has magnitude and direction
Example :
a Car stopping at the rate of 5 m/s. In this example, the direction of acceleration is the opposite of the direction of velocity, and the magnitude is 5 m/s
Hope this helps
Answer:
D
Explanation:
moving car experience the most is the Tyre
Use the formula for kinetic energy.
KE=1/2mv^2
KE=1/2*(82kg)*(2.8m/s)^2
KE=321.4 J
The answer is C
Both are mechanical waves (they must have a substance to travel through)