Question Detail
Question
A stone is dropped from rest from the edge of a cliff. What is its speed after falling for 3 seconds? (Ignore air resistance and take g = 10 m/s²)
Correct Answer
Option C is the correct answer.
Detailed Explanation
For an object dropped from rest (v₀ = 0) and moving under constant acceleration g, its velocity after time t is given by v = gt. Therefore, after 3 seconds, v = (10 m/s²)(3 s) = 30 m/s.
Hint
The object starts from rest and accelerates downwards at g. The relationship between velocity, acceleration, and time is v = at for zero initial velocity.