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Q: What is the kinetic energy of a ball of mass 2kg moving at a speed of 30ms-¹?
  • A. 900N
  • B. 900J
  • C. 900W
  • D. 900Pa
Correct Answer: Option B - Kinetic energy is directly proportional to the mass of the object and to the square of its velocity. K.E. = 1/2 m v² here, m = 2 kg, v = 30 m/s = 2 ×30 ×30/2 = 900 J
B. Kinetic energy is directly proportional to the mass of the object and to the square of its velocity. K.E. = 1/2 m v² here, m = 2 kg, v = 30 m/s = 2 ×30 ×30/2 = 900 J

Explanations:

Kinetic energy is directly proportional to the mass of the object and to the square of its velocity. K.E. = 1/2 m v² here, m = 2 kg, v = 30 m/s = 2 ×30 ×30/2 = 900 J