1.

If an object's speed is changing, which of the quantities could remain constant?

Answer»

Displacement
velocity
ACCELERATION
linear momentum

Solution :If an object's speed is changing, its position is changing [eliminate (A)]. Since velocity is defiined as magnitude and DIRECTION, a change in the magnitude (speed) means a change in velocity [eliminate (B)]. Momentum is defined as p=mv. If velocity is changing, then momentum is changing [eliminate (D)]. kinetic ENERGY is defined as `K=(1)/(2)mv^(2)`. if velocity is changing, then kinetic energy is changing. acceleration is definedas change in velocity over TIME. the answer is (C). in many cases, your acceleration can be constant if the velocity is increasing/decreasing ataconstant rate.


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