The momentum of a truck is increased by a factor of 2; its weight does not change. Thus,
A) its acceleration is doubled.
B) its speed doubled.
C) its speed increased by a factor of 4.
D) its kinetic energy doubled.

Question

Quizplus · Accepted Answer

The momentum of an object is given by p = mv, where p is momentum, m is mass, and v is velocity. Doubling the momentum means doubling the product of mass and velocity. Since the weight, which is a measure of the gravitational force acting on the truck, is unchanged, the mass of the truck remains the same. Therefore, doubling the momentum implies doubling the velocity. This means that the truck's speed is doubled. So, the correct answer is B.

The Momentum of a Truck Is Increased by a Factor