effects of forces on motion

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If a car accelerates from 20 m s-1 to 40 m s-1 in 10 s and its forward thrust is equal to 3 kN, what is mass of this car?

If a car accelerates from 20 m s-1 to 40 m s-1 in 10 s and its forward thrust is equal to 3 kN, what is mass of this car?
  • A. 1500 tones
  • B. 150 tones
  • C. 15 tones
  • D. 1.5 tones
  • Correct Answer: Option D

A box of candies weighs 40 N. If acceleration due to gravity = 10 m s-2, mass of this box equals

A box of candies weighs 40 N. If acceleration due to gravity = 10 m s-2, mass of this box equals
  • A. 0.4 kg
  • B. 4 kg
  • C. 40 kg
  • D. None of above
  • Correct Answer: Option B