A 200 g plastic ball is at rest on a frictionless incline 06

A 200 g plastic ball is at rest on a frictionless incline 0.658 m above the surface of a table. The ball then rolls down the incline and across the table, coming to rest after a distance of 2.45 m. Which of the following the average friction on the ball while rolling across the table.

Select one:

a. 7.30 N

b. 0.527 N

c. 1.96 N

d. 1.29 N

Solution

conservation of energy

mgH= f*d
0.2x9.81x0.658 = fx2.45

f= 0.527 N