Two people collide on a busy city street. What information is needed to calculate the force one of the people exerts on the other person?

To calculate the force one of the people exerts on the other during a collision, you would primarily need:

**B. the mass and acceleration of each person**

Newton's second law states that \( F = ma \), where \( F \) is the force, \( m \) is the mass, and \( a \) is the acceleration. Knowing the mass and acceleration of each person allows you to calculate the force involved in the collision. The velocity and speed can provide insight into the situation, but they do not directly correlate to the force without the information on how quickly each person is changing that velocity (acceleration). Additionally, the location of the collision is not necessary for calculating the force exerted during the collision itself.