The work output is 
Explanation:
The power of the snowmobile is

Keeping in mind that

We can convert it into Watts:

The energy used by the snowmobile can be found as follows:

where
P = 111,900 W is the power used
t = 15 s is the time interval
Substituting,

However, the snowmobile is 18% efficient: this means that only 18% of this energy is converted into useful work. Therefore, the work output is

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Answer:
this dont even explain the question
Explanation:
At a roller coaster, energy conversions from potential to kinetic energy and back repeatedly several times across the course of a trip. Kinetic energy is the force that an object possesses as a consequence of its movement.
All moving objects possess kinetic energy, which is defined with the mass and speed of the object. Potential energy is the energy that is deposited in an object due to its position corresponding to some zero point. Gravitational potential energy is highest at the top of the looping point of a roller coaster and smallest at the deepest end.
The answer is, "an unbalance force has acted on the vehicle". The vehicle will not change its states, unless otherwise there is a force acted upon on the object, that compel it to move in its original position, or to cause to change its direction of motion. This unbalance force cause the vehicle to move in the direction of the applied force.
A. Leave roots in the soil after harvesting
B. Plant trees around the fields to block wind