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what is the average velocity of the car over the first 0.25m? m/s

what is the average velocity of the car over the second 0.25m? /s

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0.11 m/s and 0.28 m/s

Explanation:

Average velocity is defined as the ratio of total displacement covered to the total time taken.

For first 0.25 m

Total displacement = 0.25 m

Total time taken = 2.23 second

Average velocity = 0.11 m/s

For second 0.25 m

Total displacement = 0.50 - 0.25 = 0.25 m

Total time = 3.13 - 2.23 = 0.9 second

Average velocity = 0.28 m/s

7.175*10^18

Explanation:

Energy of a wave:

E = nhc/λ, where

E = energy of the wave

n = no of photons

h = Planck's Constant

c = speed of light

λ = wavelength of the wave

4000 = (n * 6.63*10^-34 * 3*10^8) / (510*10^-9)

4000 = 1.989*10^-25 * n / 510*10^-9

4000 = 3.9*10^-19 * n

n = 1.025*10^22 photons per second per meter²

7.0 cm² = 7.0 / 10,000 m²

= 7 x 10⁻⁴

Photons per second = 1.025*10^22 * 7 x 10⁻⁴

= 7.175*10^18 photons per second