Free fall Knowledge-Based Practice

Questions

1. 1.

   Two balls are released from rest from the same height, with the second ball dropped 1.0 s after the first. Assuming negligible air resistance and $g = 10\text{ m/s}^2$, what is the vertical separation between the two balls 3.0 s after the first ball is dropped?

   • A) 10 m
   • B) 15 m
   • C) 20 m
   • D) 25 m
2. 2.

   A ball is released from rest and falls freely under gravity with negligible air resistance. If the ball falls a vertical distance $h$ from its release point when its speed reaches $v$, what total vertical distance has it fallen from rest when its speed reaches $3v$?

   • A) $3h$
   • B) $\sqrt{3}h$
   • C) $6h$
   • D) $9h$
3. 3.

   An object is dropped from rest and falls freely near Earth's surface, striking the ground with a speed of 40 m/s. Assuming an acceleration due to gravity of $g = 10\text{ m/s}^2$ and negligible air resistance, what is the height from which the object was dropped?

   • A) 80 m
   • B) 160 m
   • C) 40 m
   • D) 120 m
4. 4.

   An object is released from rest and falls freely under a constant gravitational acceleration of 10 m/s2. Neglecting air resistance, what distance does the object travel during the third second of its motion?

   • A) 15 m
   • B) 20 m
   • C) 45 m
   • D) 25 m

Answers and step-by-step solutions appear after you finish the test.