Which of the following is a scalar quantity? A. Energy B. Momentum C. Torque D. Impulse

Energy
Momentum
Torque
Impulse

The correct answer is A. Energy.

A scalar quantity is a physical quantity that has magnitude but no direction. Examples of scalar quantities include mass, length, time, temperature, and energy.

B. Momentum is a vector quantity, which means it has both magnitude and direction. Momentum is defined as the product of mass and velocity.

C. Torque is also a vector quantity. Torque is defined as the product of force and the distance from the point of application of the force to the axis of rotation.

D. Impulse is a vector quantity. Impulse is defined as the product of force and time.

In conclusion, the correct answer is A. Energy.