An object with mass $m = 2$ (kg) starts moving
from point A in the figure with a speed of 2
(m/s), reaches point D and stops there. The BC
and DC sections of the road have some friction
and the coefficients of kinetic friction are
$\mu_1 = 0.2$ and $\mu_2$, respectively.
Based on this information, answer the
following two questions (15-16).
$(g = 10 \text{ (m/s}^2), \cos 53^\circ = 0.6 \text{ ve } \sin 53^\circ = 0.8)$
15) What is the coefficient of kinetic friction, $\mu_2$?
D
$h_2 = 2m$
$53^\circ$
C
B
x = 8m
a) 0.1
b) 0.2
c) 0.3
d) 0.4
e) 0.5
16) What is the work done by the gravitational force in CD part of the road in (J) unit?
a) -16
b) -24
c) -40
d) -18
e) -12
A
$h_1 = 4m$
