A truck moving at a speed of 20 miles per hour collides with a stationary car. During the collisions, compare the magnitude of the force exerted by the truck on the car to the magnitude of the force exerted by the car on the truck. There may be other forces actiong on either one of them. the force exerted by the truck on the car is greater than the force exerted by the car on the truck.
the force exerted by the truck on the car is lesser than the force exerted by the car on the truck.
the force exerted by the truck on the car is equal to the fore exerted by the car on the truck.
Insufficient information to answer the question.

 the mass of an object multiplied by its velocity.

A moving object can have a large momentum if it has a large mass, a high speed, or both.

It is harder to stop a large truck than a small car when both are moving at the same speed.

The truck has more momentum than the car. By momentum, we mean inertia in motion.

Momentum Equation

momentum = mass × velocity

momentum = mv

When direction is not an important factor,

momentum = mass × speed

Impulse

The quantity force × time interval is called impulse.

A force sustained for a long time produces more change in momentum than does the same force applied briefly.

Both force and time are important in changing an object's momentum.

When you push with the same force for twice the time, you impart twice the impulse and produce twice the change in momentum.

Impulse Changes Momentum

The change in momentum depends on the force that acts and the length of time it acts.

If the momentum of an object changes, either the mass or the velocity or both change.

The greater the force acting on an object, the greater its change in velocity and the greater its change in momentum.

A glass dish is more likely to survive if it is dropped on a carpet rather than a sidewalk. The carpet has more "give."

Since time is longer hitting the carpet than hitting the sidewalk, a smaller force results.

The shorter time hitting the sidewalk results in a greater stopping force.

The safety net used by circus acrobats is a good example of how to achieve the impulse needed for a safe landing.

The safety net reduces the stopping force on a fallen acrobat by substantially increasing the time interval of the contact.

Explanation:

come closer and become far apart and become steam/gas