A block of mass m is at rest at the origin at t=0. It is pushed with constant force f0 from x=0 to x=l across a horizontal surface whose coefficient of kinetic friction is μk=μ0(1−x/l). That is, the coefficient of friction decreases from μ0 at x=0 to zero at x=l.

Assessment includes a. interviews, recorded conversations, videos, frequency counts, and time samples. b. formal standardized tests and developmental screening tools. c. various types of documented observations, documentation of child work, checklists, rating scales, and standardized tests. d. anecdotal notes, narratives or daily records, daily health checks, and teacher observation checklists.

Essay questions may also be referred to as a. talk questions c. hard questions b. explain questions d. think questions

Of the population of the united states is obese. a. 10% b. 25% c. 33% d. 50% select the best answer from the choices provided. a b c d