The car starts from rest at s = 0 and increases its speed at at = 4 m/s2. Determine the time when the magnitude of acceleration becomes 20 m/s2. At what position s does this occur.

2/42 Packages enter the 3-m chute at A with a speed of 1.2 m/s and have a 0.3g acceleration from A to B. If the packages come to rest at C, calculate the constant acceleration a of the packages from B to C. Also find the time required for the packages to go from A to C. A -3 m B Problem 2/42 3.6 m C

The roller coaster car travels down the helical path at constant speed such that the parametric equiations that define its position are             x = c sin kt , y = c cos kt, z= h - bt, where c, h and b are constants. Determine the magnitudes of its velocity and acceleration.