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Physics Physic: Kinetic Energy


Apr 6, 2016
A block of mass 9kg is initially at rest at the top of an inclined plane of ramp length 4m.

-Assuming that the plane is frictionless, calculate the speed of the block at the bottom of the plane.

-Now instead assume the a frictionless force of Ffr = 2 newtons opposes the motion of the block. Calculate the speed of the block at the bottom of the plane


I am stuck may anyone help me?


Staff member
Feb 24, 2012
Okay, first you need to compute the initial energy of the block, and the final energy of the block, and equate the two since there are no non-conservative forces at work.

Initially, the block has no kinetic energy, but it has gravitational potential energy. Can you give the total initial energy?