2. 1D Motion / Kinematics

How does air resistance affect the acceleration of a falling object during free fall?

As an air mass rises vertically in the atmosphere, what typically happens to its temperature?

A package is dropped from rest from a height $h$ above the ground, neglecting air resistance. What is the speed $v_f$ of the package when it hits the ground?

When an object is in free fall near Earth's surface, what is the only force acting on it?

Suppose a car manufacturer tested its cars for front-end collisions by hauling them up on a crane and dropping them from a certain height. What height corresponds to a collision at 35 km/h?

When you throw a ball directly upward, what is the velocity $v$ of the ball at its highest point?

Why are objects that fall near Earth's surface rarely in free fall?

When a feather and a coin are dropped in a vacuum, they fall with equal $\mathrm{what}$?

If you dropped a rock from rest and it fell $4.9$ meters in $1$ second, what is the approximate value of the acceleration due to gravity $g$ assumed in this calculation?

For a ball that is dropped from rest and falls freely under gravity, which of the following correctly describes its velocity $v$ as a function of time $t$ (neglecting air resistance)?

A pellet gun is fired straight downward from the top of a $50m$ tall building with an initial speed of $10m/s$. Ignoring air resistance, how long does it take for the pellet to reach the ground? (Take $g=9.8m/s^2$)

A ball is thrown from the edge of a cliff in three different ways: (A) straight upward with an initial speed $v>0$, (B) straight downward with the same initial speed $v$, and (C) horizontally with speed $v$. Neglecting air resistance, rank the throws from longest to shortest time for the ball to hit the ground.

During the vertical motion of a projectile, is the vertical component of velocity ($v\_y$) ever zero? If so, when does this occur?

An object is thrown vertically upward and reaches its highest point. Ignoring air resistance, what is its velocity $1$ second after it reaches its highest point?