Question Detail
Question
A 2 kg block hangs from a spring balance which is attached to the roof of an elevator. What does the balance read when the elevator is moving up with a constant velocity of 30 m/s? acceleration due to gravity, g = 10 m/s².
Correct Answer
Option D is the correct answer.
Detailed Explanation
At constant velocity, acceleration = 0, so tension = weight = mg = 2 × 10 = 20 N.
Hint
Balance reads tension, which equals weight when no acceleration.