Daryl the delivery guy gets out of his pizza delivery truck but forgets to set the parking brake. The 2,000.-kilogram truck rolls down hill reaching a speed of 30 m/s just before hitting a large oak tree. The vehicle stops 0.72 s after first making contact with the tree. a. How much momentum does the truck have just before hitting the tree?

b. What is the average force applied by the tree?

think about the oscillation of the toy shown in the video. when the toy is at the highest point of its motion, its velocity is zero and its acceleration is negative.

lexy is right because she has the labeled s

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