Question

Jenny was applying her makeup when she drove into the student parking lot last Friday morning. Unaware that Cheryl was stopped in her lane ahead, Jenny rear-ended Cheryl's car. Jenny's 1300-kg car was moving at 11 m/s and stopped in 0.14 seconds. Determine the change in momentum for Jenny's car.

A. 0 kg*m/s

B. 182 kg*m/s

C. 14300 kg*m/s

D. 118.18 kg*m/s

Answer 1

C. 14300 kg*m/s

Step-by-step explanation:

The momentum of Jenny's car is the product of its mass and velocity:

mv = (1300 kg)(11 m/s) = 14300 kg·m/s

After the collision, the velocity and momentum are 0. So, the change in momentum is (a decrease of) ...

14300 kg·m/s