If an object is at rest 500 m above the ground and it falls to the ground, what is its velocity when it hits the ground (neglecting air resistance)?
A. 70 m/s
B. 99 m/s
C. 9810 m/s
D. 9.81 m/s
E. Insufficient information to solve
A. Incorrect. You forgot a factor in your calculation. Reexamine your work.
B. Correct. All potential energy will have been transformed to kinetic energy at the ground.
C. Incorrect. You made a mistake in your algebra. Check how you solved for velocity.
D. Incorrect. The number (9.81) is the common acceleration due to gravity, but the units are incorrect for that. It is also not the answer to the question, which seeks velocity.
E. Incorrect. This problem can be solved from the given information. Note that answer is the same for any mass object, so the mass of the object doesn’t need to be known.
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