A 1 kg object is dropped from a height of 5 meters. What is its velocity just before hitting the ground?
Correct answer: C. 10 m/s
- A. 0 m/s
- B. 5 m/s
- C. 10 m/s
- D. 7.07 m/s
Explanation
When an object falls freely under the influence of gravity, its final velocity just before hitting the ground can be calculated using the kinematic equation:Final Velocity squared = Initial Velocity squared + 2 * acceleration * heightGiven that the object is dropped (initial velocity is 0 m/s), the acceleration due to gravity is approximately 9.8 m/s², and the height is 5 meters:Final Velocity squared = 0^2 + 2 * 9.8 m/s² * 5 m = 98 m²/s²Taking the square root of 98 m²/s²:Final Velocity = √98 ≈ 10 m/sSo, the velocity of the object just before hitting the ground is approximately 10 m/s.
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