Question

A piece of ice slides down a 45° incline in twice the time it takes to slide down a frictionless 45° incline. What is the coefficient of friction between the ice and incline?

• A. 0.25
• B. 0.50
• C. 0.75
• D. 0.40

Answer 1

Answer: (C)

0.75

Answer 2

c)

Sol. m = tanq $\left( 1 - \frac { 1 } { \mathrm { n } ^ { 2 } } \right)$ [discussed in class room]

= tan 45 $\left( 1 - \frac { 1 } { 2 ^ { 2 } } \right)$ = ¾