A crate of fruit with a mass of 34.0 kg and a specific heat capacity of 3750 J/(kg⋅K) slides 8.30 m down a ramp inclined at an angle of 38.4 degrees below the horizontal. If the crate was at rest at the top of the incline and has a speed of 2.45 m/sat the bottom, how much work was done on the crate by friction?Use 9.81 m/s² for the acceleration due to gravity and express your answer in joules.

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.

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