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Author Question: A karate master strikes a board with an initial velocity of 12.0 m/s, decreasing to 3.0 m/s as his ... (Read 117 times)

humphriesbr@me.com

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on: Jul 28, 2018
A karate master strikes a board with an initial velocity of 12.0 m/s, decreasing to 3.0 m/s as his hand passes through the board. If the time of contact with the board is 0.002 s, and the mass of the coordinated hand and arm is 1.0 kg, what is the force exerted on the board?
 a. 7.5E+3 N
  b. 1.8E2 N
  c. 3.0E2 N
  d. 4.5E+3 N
  e. 6.0E+3 N

Question 2

A boxcar of mass 125 tons at rest becomes uncoupled on a 2.0 grade. If the track is considered to be frictionless, what speed does the boxcar have after 9.0 seconds?
 a. 4.0 m/s
  b. 0.038 m/s
  c. 31 m/s
  d. 3.1 m/s
  e. 0.31 m/s


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af

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Reply #1 on: Jul 28, 2018
Answer to Question 1

d

Answer to Question 2

d


humphriesbr@me.com

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Reply #2 on: Jul 28, 2018
TY


af

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Reply #3 on: Jul 28, 2018
You're welcome


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