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Force and motion

  • Thread starter Cantworkit
  • Start date
  • #1
12
0

Homework Statement


In throwing a 200-g ball, one's hand exerts a constant upward force of 9.4 N for 0.32 s. How high does the ball rise after leaving the hand? Book answer is 7.2 m.


Homework Equations


F = ma
v = v0 + at
y - y0 = v^2/2g

The Attempt at a Solution



Fup + Fdn = Fnet
aup = Fup/m = 9.4 kg-m/s^2/200g*1000g/kg = 47 m/s^2
v0 = at = 47m/s^2 * 0.32s = 15 m/s
y-y0 = v0^2/2g = (15)^2/2 * 9.8 = 11.5 m
 

Answers and Replies

  • #2
737
0
Which should you use: aup or anet?
 

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