1. A racing car accelerated uniformly from 44 m/s to 66 m/s in an 11 second period. Determine its acceleration. 2. A racing car car uniformly from 66 m/s in an 11 seconds period. Determine its acceleration.

3. A train moving 15 m/s is uniformly accelerated to
17 m/s over 12 seconds period. Finds its acceleration.

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".