A 0.75-kg sphere is released from rest and is moving 5.0 m/s ...

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A 0.75-kg sphere is released from rest and is moving 5.0 m/s after falling 2.0 m in a viscous medium. What is the change in mechanical energy caused by the force the viscous medium exerts on the sphere during this descent?
 a. -6.1 J
  b. -4.6 J
  c. -5.3 J
  d. -6.8 J
  e. -2.7 J

Question 2

A 1.5-kg block sliding on a rough horizontal surface is attached to one end of a horizontal spring (k = 200 N/m) which has its other end fixed. If this system is displaced 20 cm horizontally from the equilibrium position and released from rest, the block first reaches the equilibrium position with a speed of 2.0 m/s. What is the coefficient of kinetic friction between the block and the horizontal surface on which it slides?
 a. 0.34
  b. 0.24
  c. 0.13
  d. 0.44
  e. 0.17

[otokexnaru]

Answer to Question 1

C

Answer to Question 2

A

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TYSM

[miss_1456@hotmail.com]

Thanks for the timely response, appreciate it