Question

A stone is released from an elevator going up with an acceleration a. The acceleration of the stone after the release is _____.

• A. a upward
• B. (g-a) upward
• C. (g-a) downward
• D. g downward

Answer 1

The correct option is D g downward

This is a conceptual question which tests your knowledge about relative acceleration.

Well, the trick in this question is that it is not mentioned which acceleration should be found out.

Acceleration of stone wrt Earth is g downwards

Acceleration of stone wrt lift is (g+a) downwards

The acceleration caused on stone by lift is downwards as the lift is moving upwards, therefore, the force(and acceleration) due to the acceleration of lift will act downward.

As the option of(g+a) is not given it has to assume the acceleration is asked wrt to earth which is g downwards