Answer:
I've combined both answers on a single graph.
Explanation:
The basic steps are simple but careful
planning is needed. Sand dune restoration should be designed to create a dune that matches the
existing natural dune pattern in the area. You can help
speed up nature's work by using sand fences and dune
plants to collect sand more rapidly. Or in a different way, wind would bring more sand to create a dune. hope this helped, have an amazing day :)
The second option rolling friction
Answer
1400 * 0.8 = 1,120
the useful energy output is 1,120 joules
To develop this problem it is necessary to apply the concepts related to the Dopler effect.
The equation is defined by

Where
= Approaching velocities
= Receding velocities
c = Speed of sound
v = Emitter speed
And

Therefore using the values given we can find the velocity through,


Assuming the ratio above, we can use any f_h and f_i with the ratio 2.4 to 1


Therefore the cars goes to 145.3m/s