A block of mass 4.0 kg rests on a horizontal surface where the ...

[CBme]

A block of mass 4.0 kg rests on a horizontal surface where the coefficient of kinetic friction between the two is 0.20 . A string attached to the block is pulled horizontally, resulting in a 3.0-m/s2 acceleration by the block. Find the tension in the string. (g = 9.80 m/s2)
 a. 12 N
  b. 7.8 N
  c. 20 N
  d. 4.2 N

Question 2

A physics student is riding on a train traveling north. Having read about inertia, the student performs an experiment with a golf ball. He reaches over the aisle and drops the ball from rest. Instead of hitting the floor directly below the student's hand, it hits to the north, i.e., forward of that position. Which of the following might be the cause for this to happen?
 a. The train is moving at constant velocity. b. The train is speeding up.
  c. The train is slowing down. d. Whatever the cause, it cannot be any of the answers given.

[hanadaa]

Answer to Question 1

c

Answer to Question 2

c

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Thanks

[hanadaa]

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