Author Question: An object of mass 20 kg is raised vertically through a distance of 8.0 m above ground level. Using g ... (Read 150 times)

londonang · **on:** Jul 29, 2018

An object of mass 20 kg is raised vertically through a distance of 8.0 m above ground level. Using g = 10 m/s2 what is the potential energy of this object at this position?

A) 1.6 J
B) 16 J
C) 160 J
D) 1600 J
E) 16000 J

Question 2

A 50.0-N box is sliding on a rough horizontal floor, and the only horizontal force acting on it is friction. You observe that at one instant the box is sliding to the right at 1.75 m/s and that it stops in 2.25 s with uniform acceleration.

What magnitude force does friction exert on this box? A) 3.97 N
B) 8.93 N
C) 38.9 N
D) 50.0 N
E) 490 N