Directions: Show work for all the questions that requires them. Round off your answers to the nearest tenths, and abbreviate your units and directions.

1) Which isnotaccelerating?

a. A car moves shortly after a stoplight turns green.

b. A car with the cruise control set at 80 km/h

c. A car approaching a red light

d. A car turning a curve at a constant speed

2) A highway engineer wants to calculate the length of an on-ramp so that a car accelerating from rest at a rate of 12.4 m/s2 is able to reach a velocity of 20.0 m/s at the end of the ramp. How long must the on-ramp be to meet these conditions? Show work*

3) How far will a ball travel if it started from rest, reaches an acceleration of 4 m/s^2, and a velocity of 6m/s? Show work*

4) If the acceleration is in the same direction as the velocity, the speed increases and the acceleration is

a. cannot be determined

b. constant

c. negative

d. positive

5) Which graph represents zero acceleration?

\f70 m = Ay Ax 8 8 AV a At Velocity (m/s) I AV 30 ....... At 20 10 O CO N 10 Time (s)A B Velocity (m/s) Velocity (m/s) Time (set) Time (sex) C D Velocity (m/s) Velocity (m/s) Time (set) Time (sex)