Question

Momentum and Kinetics

As a medical professional, you have volunteered to serve on a committee investigating injuries to middle school students participating in sports programs. Currently, your committee is investigating the high incidence of ankle injuries on the basketball teams. You are watching the teams practice, and looking for activities which can result in large horizontal forces on the ankle. Observing jump shots gives you an idea, so you try a small calculation. A 40 kg students jumps 1.0 meters straight up and shoots the 0.80 kg basketball at her highest point. From the trajectory of the basketball, you deduce that the ball left her hand at 30 degrees from the horizontal at 20 m/s. What is the player's horizontal velocity when she hits the ground?

Answer 1

Momentum is conserved in honzantal direction m, = 0.50kg 4,20 Na = 2066530 » 17.32 m/s m = 40kg U2=0 V₂ = ? mie,+ m₂ų = min, tmz 2=mvi=0.80X 17.32 70-3464 m/s- m2 40 sree axzo Wa alla=-0.3464 m/s Horizontal velocity = -0.346urls CS Scanned with CamScanner