A boy pushes a 500kg box along a floor with a force of 2000N. If the velocity of the box is uniform, the co-efficient of friction between the box and the floor is
A
1
B
0.8
C
0.65
D
0.4
Verified Correct Answer: D.
Physical Principles & Numerical Solution
m = 500kg, W = mg = 500 \times 10 = 5000N
F = 2000N
\mu
=
Force at constant velocity
weight
=
2000
5000
=
0.4
Source: Myschool Past Questions Archive (Record #55657)