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Author Question: A ball is thrown with an initial velocity of 20 m/s at an angle of 60 above the horizontal. If we ... (Read 72 times)

james

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on: Jul 29, 2018
A ball is thrown with an initial velocity of 20 m/s at an angle of 60 above the horizontal. If we can neglect air resistance, what is the horizontal component of its instantaneous velocity at the exact top of its trajectory?
 
  A) 10 m/s
  B) 17 m/s
  C) 20 m/s
  D) zero

Question 2

A sled having a certain initial speed on a horizontal surface comes to rest after traveling 10 m. If the coefficient of kinetic friction between the object and the surface is 0.20, what was the initial speed of the object?
 
  A) 9.8 m/s
  B) 6.3 m/s
  C) 3.6 m/s
  D) 7.2 m/s
  E) 8.9 m/s


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shoemake

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Reply #1 on: Jul 29, 2018
Answer to Question 1

A

Answer to Question 2

B


james

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Reply #2 on: Jul 29, 2018
TY


shoemake

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Reply #3 on: Jul 29, 2018
You're welcome


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