14.A rocket sled accelerates from 10 m/s to 40 m/s in 2 seconds. What is the average acceleration of the sled? Part A:Which equation is the correct one to use in this prroblem?

A. v=gt B. Δy=1/2gt^2 C. a=Δv/Δt D. v=Δx/Δt

Part B:Answer rounded to nearest whole number?

Part C:Units?

2.Which of the following is a pair of vector quantities?

Speed and Displacement.
Speed and Distance.
Velocity and Displacement.
Velocity and Distance.
7.Use the following graph of a motorcycle to answer the questions.
(the attactment for this questions is 7b)
Part A:

In which section is the motorcycle traveling at a constant velocity?

Section AB.
Section BC.
Section CD.
Section DE.
Part B:

In which section does the motorcycle have the greatest acceleration?

Section AB.
Section BC.
Section CD.
Section DE.
Part C:

In which section does the motorcycle have a negative acceleration?

Section AB.
Section BC.
Section CD.
Section DE.
Part D:

What is the acceleration of the motorcycle in section CD?

0 m/s^2
7.14 m/s^2
30 m/s^2
50 m/s^2