The Equation Below Describes a Physical Situation Which Description Best Fits the Equation?
A)A 1

Multiple Choice

The equation below describes a physical situation: $$\frac { 1 } { 2 } ( 1.70 \mathrm {~kg} ) \left( 3.30 \frac { \mathrm { m } } { \mathrm { s } } \right) ^ { 2 } + ( 1.70 \mathrm {~kg} ) \left( 9.80 \frac { \mathrm { m } } { \mathrm { s } ^ { 2 } } \right) ( 2.35 \mathrm {~m} ) \sin 30 ^ { \circ }$$ $$= \frac { 1 } { 2 } ( 1.70 \mathrm {~kg} ) \left( 4.60 \frac { \mathrm { m } } { \mathrm { s } } \right) ^ { 2 } + 0.320 ( 1.70 \mathrm {~kg} ) \left( 9.80 \frac { \mathrm { m } } { \mathrm { s } ^ { 2 } } \right) ( 2.35 \mathrm {~m} ) \cos 30 ^ { \circ }$$ Which description best fits the equation?

A) A 1.70 kg block slows down while sliding down a frictionless plane inclined at a 30 $\degree$ angle.
B) A 1.70 kg block slows down while sliding down a plane with $\mu$ _k = 0.320,with the plane inclined at a 30 $\degree$ angle.
C) A 1.70 kg block speeds up while sliding up a frictionless plane inclined at a 30 $\degree$ angle.
D) A 1.70 kg block speeds up while sliding down a plane with $\mu$ _k = 0.320,with the plane inclined at a 30 $\degree$ angle.
E) A 1.70 kg block slides over the top of an inclined plane and then descends on the other side.Both planes,inclined at a 30 $\degree$ angle,have $\mu$ _k = 0.320.