5/4/2016 11:00 AM A Time Remaining: 17 M 3 S Gradebook Question 6 of 8 sapling l

Question

5/4/2016 11:00 AM A Time Remaining: 17 M 3 S Gradebook Question 6 of 8 sapling learning Sean Cordry at Walters State Community College Map Tarzan (mT 85.0 kg) swings down from the cliff and has a speed of 11.0 m/s just before he impacts Jane (mj- 55.0 kg) Answer the two questions below, using three significant digits Part A Suppose the Tarzan is able to grab Jane, and the two of them swing together as a single unit. What is the speed of the pair (vp)? Number m/ s Part B: Suppose that Tarzan isn't fast enough to grab Jane secure, and instead, he bumps her, sending her forward. He has a forward speed of 2.05 m/s. What is Jane's forward speed (vj)? Number m/ s Previous Next Save And Exit

Explanation / Answer

Tarzan mass mt = 85 kg, speed vt just impact jane = 11.0 m/s,
jane mass mj = 55 kg, initially she is at rest u j = 0 m/s

PartA

   conservation of momentum

   momentum of both before impact = momentum after impact

   mt*vt +mjvj = (mt+mj)Vp

   V = mt*vt +mjvj /(mt+mj)
   = 85*11+55*0 /(85+55)m/s
   = 6.6786 m/s

   Vp = 6.6786 m/s

Part B

   mtvt = mjvj ==> vj = mt vt / mj = 85*2.05 /55 = 3.168 m/s

janes forward speed vj = 3.168 m/s.

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