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JAMB Physics 2000 Question 11

Question 11

Newton's Laws and Momentum

A rope is being used to pull a mass of 10 kg vertically upward. Determine the tension in the rope if, starting from rest, the mass acquires a velocity of 4 m s−1 in 8 s. [g = 10 m s−2]

  1. A.105 N
  2. B.95 N
  3. C.50 N
  4. D.5 N
Show the answer and explanation

Answer: A (105 N)

Explanation

a = 4/8 = 0.5 m s−2 upwards. T − mg = ma, so T = 10 × 10 + 10 × 0.5 = 105 N.