Which of these is not an example of acceleration?
a. moving at 20 m/s in a circle
b. speeding up from 5 m/s to 10 m/s
c. slowing down from 10 km/h to 5 km/h
d. moving at a constant speed of 150 km/h

When a 5.0kg cart undergoes a 2.2m/s increase in speed, what is the impulse of the cart

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

What do you think car designers do if the damage caused by a crash test is too severe?