Would someone kindly help me? :) At a construction site, one worker passes a brick to another by pushing it across a piece of wood. The brick has a mass of 2.7 kg. Th e force required to start the brick moving is 18 N. What is the maximum coefficient of static friction between the brick and the wood?

Thank you to whoever answers!

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".

Complete the sentence to describe the law of conservation of energy. the law of conservation of energy states that energy cannot be created

If a car has a speed of 20 m/s, how long will it take to go 155 m? a. 3100 s b. 135 s c. 2.1 s d. 7.8 s