Which statement is TRUE of a block of stone of mass m, with zero momentum?

Step 1: Analyze the question We are told a stone of mass m has zero momentum. We must pick the statement that must be true.

Step 2: Concept Momentum is given by:

p = m × v

Step 3: Solution

• Given p = 0 and m ≠ 0 (the stone has mass), then v = p/m = 0.
• So the stone's velocity is zero at that instant. This means the stone is stationary (at rest).

Checking the other options:

• A. Non-uniform acceleration: nothing is said about acceleration. Zero momentum does not tell us this.
• C. Constant velocity: this would suggest it is moving, but the velocity is zero. (Strictly, zero is a constant, but the option implies motion, and it is not guaranteed to stay at zero.)
• D. Maximum velocity: the velocity is zero, so it is not moving at a maximum.
• E. Minimum velocity: this is not the usual interpretation, and it is not what zero momentum is meant to convey. The best, direct conclusion is that the stone is at rest.

The best answer is that the stone is stationary.

Tip: Whenever you see "zero momentum" for an object with mass, think "zero velocity," so the object is at rest. Remember p = mv: if p = 0 and m ≠ 0, then v = 0.