Kinematics and Motion Variables (4A) Practice Test

In a motion-capture pilot study, a 0.20-kg cart moves along a straight, level track. At $t=0$ s, its velocity is $+2.0\ \text{m/s}$ (to the right). From $t=0$ to $t=3.0$ s, the cart experiences a constant acceleration of $-1.0\ \text{m/s}^2$ due to a calibrated magnetic brake. Which statement best describes the cart’s velocity change over this interval?

A drone used for environmental sampling flies along a straight line. Its onboard logger shows velocity readings of $+4.0\ \text{m/s}$ at $t=10$ s and $+4.0\ \text{m/s}$ at $t=12$ s. Which statement best describes the drone’s average acceleration between 10 s and 12 s?