A block of mass 4.2 kg is projected with speed 14 m s−1 up an inclined plane making an angle 28∘ with the horizontal. The dynamic coefficient of friction between the block and the inclined plane is 0.42, and the static coefficient is 0.55.
a. a After how much time will the block stop?
b. b What distance will the block cover?
c. c When the block stops, will it then slide down the plane, or will it stay at rest?
d. d In another experiment the same block is projected *down* the plane with the same speed as before. Will the block stop?