Author Question: In a given frictionless displacement of a particle, its kinetic energy increases by 25 J while its ... (Read 50 times)

ashley · **on:** Jul 28, 2018

In a given frictionless displacement of a particle, its kinetic energy increases by 25 J while its potential energy decreases by 10 J. Determine the work of the nonconservative forces acting on the particle during this displacement.
a. -15 J
b. +35 J
c. +15 J
d. -35 J
e. +55 J

Question 2

A 2.0-kg block sliding on a rough horizontal surface is attached to one end of a horizontal spring (k = 250 N/m) which has its other end fixed. The block passes through the equilibrium position with a speed of 2.6 m/s and first comes to rest at a displacement of 0.20 m from equilibrium. What is the coefficient of kinetic friction between the block and the horizontal surface?
a. 0.32
b. 0.45
c. 0.58
d. 0.19
e. 0.26