Agallon of gasoline contains about 1.3 x 108joules
of energy. a 2000 kg car traveling at 20 m/s skids to astop.
estimate how much gasoline it will take to bring the car backto the
original speed? to complicate matters further, consider thefact
that only about 15% of the energy extracted from gasolineactually
propels the car. the rest gets exhausted as heat andunburnt
fuel.

The amount of gasoline is .

Explanation:

Given that,

Energy contained in gasoline

Mass = 2000 kg

Speed = 20 m/s

Energy used propel the car

We need to calculate the work done by the frictional force to stop the car

Using formula of work done

Therefore,

Work done to bring the car back to its original speed

Hence, The amount of gasoline is .

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards