A penny at rest is dropped from the top of a tall stairwell. What is the pennys velocity after it has fallen for 2 seconds..(don’t answer this one) The same penny hits the ground in 4.5 seconds. What is the pennys velocity as it hits the ground? PLS ANSWER THIS ON

Road users moving into your lane, brake lights, and abrupt changes in road surface are a. rare at night b. indicators of potential hazards c. not worth worrying about before you reach them d. no problem for experienced drivers

(a) assume the equation x = at^3 + bt describes the motion of a particular object, with x having the dimension of length and t having the dimension of time. determine the dimensions of the constants a and b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.) (b) determine the dimensions of the derivative dx/dt = 3at^2 + b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.)

How does the entropy of steam compare to the entropy of ice?