Freefall Problems

1. An object, initially at rest, falls freely near the earth’s surface. How long does it take the object to reach a speed of 98 m/s ?
 

 


2. A rock is dropped from a cliff. Approximately how long does it take to fall 45 m ?
 

 


3. What is the speed of a rock, initially at rest, that has fallen 66 m near the Earth’s surface ?

 



4. An astronaut drops a rock from rest on the Moon’s surface. How far will the rock fall in 2.0 s ? (Acceleration due to gravity on the Moon is 1.6 m/s2)

 



5. A student drops an object from the top of a building which is 19.6 m high. How long does it take the object to fall to the ground ?


 


6. An object is allowed to fall freely near the surface of a planet. The object falls 54 m in the first 3.0 s. The acceleration due to gravity on that planet is _______________


 


7. A clam dropped by a seagull takes 3.0 s to hit the ground. What is the sea gull's approximate height above the ground at the time the clam was dropped ?