Your physical education teacher throws you a tennis ball at a certain velocity, and you catch it. you are given the following choice, the teacher can throw you a medicine ball (which is more massive than the tennis ball) which option would you choose in order to make the easiest catch? a) same kinetic energy b) with the same velocity c) same momentum?

You are driving to the grocery store at 20 m/s. you are 110m from an intersection when the traffic light turns red. assume that your reaction time is 0.50s and that your car brakes with constant acceleration. how far are you from the intersection when you begin to apply the brakes? what acceleration will bring you to rest right at the intersection? how long does it take you to stop after the light changes? the known values: vi=20m/s xi=110m t=.50s vf=0m/s xf=0m a=?