Two grocery carts collide head-on, a full one with a mass of 35 kg moving east at 2 m/s and an empty one with a mass of 10 kg moving west at 3 m/s. After the collision, the full cart is moving east at 0.75 m/s. What is the velocity of the empty cart?

1.375 m/s

Explanation:

35(2) + 10(-3) = 35(0.75) + 10x

40 = 26.25 + 10x

10x=13.75

x = 1.375 m/s

total distance/total time

(85 + 82)/(5+3)

167/8

20 just over

you'd use the equation that establishes a relationship between  energy  and  wavelength, which looks like this

e=h⋅cλ, where

λ  - the wavelength of the photon; c  - the speed of light, usually given as  3⋅108m/s; h  -  planck's constant, equal to  6.626⋅10−34j s

plug the value you were given for the energy of the photon in the above equation to get the wavelength

e=h⋅cλ⇒λ=h⋅ce

λ=6.626⋅10−34js⋅3⋅108ms−1.257⋅10−24j=1.581⋅10−1m