2. A 5 kg block moves with a constant speed of 10m/s to the right on a smooth surface where frictional forces are
considered to be negligible. It passes through a 2.0 m rough section of the surface where friction is not negligible,
and the coefficient of kinetic friction between the block and the rough section 4, is 0.2. What is the change in the
kinetic energy of the block as it passes through the rough section?
A. 20 J of energy is removed from the block.
C. 250 J of energy is removed from the block.
B. 20 J of energy is added to the block.
D. 250 J of energy is added to the block.

1= 26.17

2= 1.17

3=30.86

4=5.86

just took the assigment on edge

the correct choice is a .

do not post any more test or exam questions on

according to jean piaget, in what stage of cognitive development are children able to understand conservation task?

b. preoperational

just took it

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