If the following masses are to be stopped by the same constant force, which of the following can be accomplished in the shortest time interval?
A) Stopping a 5.0-kg mass moving at 90 m/s
B) Stopping a 10-kg mass moving at 30 m/s
C) Stopping a 10-kg mass moving at 65 m/s
D) Stopping a 20-kg mass moving at 25 m/s
E) Stopping a 20-kg mass moving at 30 m/s

Question

Quizplus · Accepted Answer

The time to stop an object is proportional to its momentum (mass times velocity). The momentum of each option is: A) 450 kg·m/s, B) 300 kg·m/s, C) 650 kg·m/s, D) 500 kg·m/s, E) 600 kg·m/s. Option B has the smallest momentum, thus it can be stopped in the shortest time interval with the same force.

If the Following Masses Are to Be Stopped by the Same