2. 1D Motion / Kinematics

A car initially at rest accelerates uniformly and reaches a speed of $20m/s$ in $5s$. What is the magnitude of the acceleration during this speeding up phase?

Which of the following best describes positive $a$?

Which statement about the acceleration of an object is correct?

When an object is speeding up to the right along a straight line, which of the following statements is true about the directions of its velocity $\mathbf{v}$ and acceleration $\mathbf{a}$ vectors?

Which of the following best describes the difference between acceleration and speed?

When an object's velocity is positive ($v>0$) and its acceleration is negative (), what happens to the object's motion?

A flea jumps vertically by rapidly extending its legs and reaches a velocity of $3.2m/s$ in $0.001s$. What is the flea's acceleration as it extends its legs?

Which of the following best describes a measure of change in velocity $\frac{\Delta v}{\Delta t}$ over a measure of time?

Which formula is used to find an object's $\mathrm{acceleration}$?

Which two factors directly affect the acceleration of an object according to Newton's second law of motion ($F=ma$)?

Which car is accelerating?$a$

Which of the following scenarios involves $a$cceleration?