Two packages at ups start sliding down the ramp. package a, Ask an Expert

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Q. A laser emits a single, 2 ms pulse of light that has a frequency of 2.83 × 10^11 Hz and a total power of 75000 W. How several photons are in the pulse?

Q. Two packages at UPS start sliding down the ramp. Package A has a mass of 6.50 and a coefficient of kinetic friction of 0.19. Package B has a mass of 9.50 and the coefficient of kinetic friction of 0.140. How long does it take package A to reach the bottom?

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