Practice Free Fall in Physics
Use these practice problems to test your method after reviewing the concept explanation and worked examples.
Quick Recap
Motion under gravity alone, with no air resistance — all objects in free fall accelerate at g \approx 9.81 m/s² regardless of mass.
A dropped ball accelerates at the same rate regardless of its mass.
Example 1
easyA stone is dropped from a cliff. How far does it fall in 3 \text{ s}? Use g = 9.8 \text{ m/s}^2.
Example 2
mediumA ball is thrown upward with an initial velocity of 20 \text{ m/s}. How high does it go, and how long until it returns? Use g = 9.8 \text{ m/s}^2.
Example 3
easyAn object is dropped from a height of 80 \text{ m}. How long does it take to hit the ground? Use g = 10 \text{ m/s}^2.
Example 4
mediumA ball is thrown straight up with an initial velocity of 20 \text{ m/s}. Using g = 10 \text{ m/s}^2: (a) How long until it reaches its highest point? (b) What maximum height does it reach? (c) What is its velocity when it returns to the starting height?