A hockey puck of mass 0.17 kg is shot across a rough floor with the roughness different at different places, which can be described by a position-dependent coefficient of kinetic friction. For a puck moving along the x-axis, the coefficient of kinetic friction is the following function of x, where x is in μ(x)=0.1+0.05x. Find the work done by the kinetic frictional force on the hockey puck when it has moved from x=0 to x=2 m.

0.4998 J

Explanation:

Mass if hockey puck=m=0.17 kg

Force acting on hockey puck=

Where

Work done =Fdx

x=0 to x=2 m

Using the formula

Work done=

Work done=

Using the formula

Work done=W=

i believe the answer is a

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles